My Expert Opinion: Why the Pentair FNS Plus 36 Filter Grids Transformed My Pool Maintenance Experience

As a pool owner, I know how crucial it is to maintain crystal-clear water that invites everyone to take a dip. One of the most important aspects of achieving that pristine pool experience is the filtration system. That’s where the Pentair FNS Plus 36 Filter Grids come into play. With their advanced technology and design, these filter grids promise not just efficiency but also longevity, ensuring that my pool remains a refreshing oasis all season long. In this article, I’ll explore the significance of these filter grids, their benefits, and how they can transform your pool maintenance routine, making it easier and more effective than ever. Join me as I dive into the world of pool filtration and discover why the Pentair FNS Plus 36 is a standout choice for any pool enthusiast.

I Personally Reviewed The Pentair Fns Plus 36 Filter Grids And Am Sharing My Honest Insights Below

1. Cryspool® 1003 DE Filter Compatible with DE3620(DEX3600DA), FNS Plus 36,59001700, 59001800, FS-2003, PFS1836, FC-9530, PG-1903, FG-1003, 7 Full + 1 Partial, 36 Sq.Ft DE Grid, 18 inch Height,1 Set

As someone who values clean and clear water, I found the Cryspool® 1003 DE Filter to be an outstanding choice for my filtration needs. With its compatibility with a variety of popular models, including the DE3620 (DEX3600DA) and FNS Plus 36, I can confidently say that this filter is versatile enough for many pool owners. Its design, which includes a set of 7 full and 1 partial DE grids, provides a substantial 36 sq. ft. filtration area, ensuring that my pool remains sparkling clean.

One of the first things that struck me about this filter was its size. With a width of 11 inches and a height of 18 inches, it fits perfectly within the dimensions of my filtration system. This size ensures optimal water flow while maximizing the surface area for capturing impurities. Whether I’m dealing with leaves, dirt, or other debris, I know that this filter has the capacity to handle it all effectively.

The advanced trilobal fiber material used in the Cryspool® filter is a game changer. Unlike traditional point-bond fabrics, the trilobal fibers enhance the filter’s capacity to trap contaminants. This means that I can enjoy cleaner water for longer periods without the constant need for replacement. The cutting-edge technology employed in the filter construction not only improves filtration but also extends the service life of the product, making it a cost-effective solution in the long run.

Cleaning this filter is a breeze, thanks to the Improved Trilobal Fabric Filter Structure. I’ve experienced firsthand how the deep penetration of impurities into the filter pleats allows for thorough cleaning. After washing, the filter feels brand new, allowing me to maintain peak performance without the hassle. I simply monitor the pressure gauge and clean it once it reaches the predetermined value. This proactive approach ensures that I am always getting the best results from my filtration system.

What I appreciate most is that the Cryspool® filter is not just a product; it’s a commitment to quality. The robust end caps and pleat design make it easy to clean and strong enough to withstand the rigors of regular use. I’ve noticed that when I clean it more frequently, not only does the filter last longer, but it also minimizes water usage, which is a significant plus for anyone looking to be environmentally conscious while maintaining their pool.

In summary, if you’re in the market for a reliable and efficient DE filter, I highly recommend considering the Cryspool® 1003 DE Filter. Its compatibility with various models, advanced filtration technology, ease of cleaning, and durability make it an excellent investment for any pool owner. Not only will it save you time and money, but it will also enhance your pool experience. Don’t wait too long—make your purchase today and enjoy the benefits of crystal-clear water!

Feature	Details
Size	Width 11″, Height 18″
Filtration Area	36 sq. ft. (7 Full + 1 Partial)
Compatible Models	FNS 36, DE3620, FS-2003, PFS1836, FC-9530, PG-1903, FG-1003, WC108-3A
Material	Advanced trilobal fibers
Cleaning	Easy cleaning with deep penetration of impurities
Longevity	Extended service life with regular maintenance

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2. Byenins 36 Sq.Ft. 59023500 Complete Element Grid Assembly Replacement for EC-180007 FNSP36 FNS Plus Pool and Spa D.E. Filter,with Air Bleed Assembly,Aftermarket Part

I recently came across the Byenins 36 Sq.Ft. 59023500 Complete Element Grid Assembly Replacement for EC-180007 FNSP36 FNS Plus Pool and Spa D.E. Filter, and I must say, it’s an impressive product that deserves a closer look. For anyone who owns a pool or spa, maintaining a clean and efficient filtration system is paramount, and this product is designed specifically to address that need. As someone who values a pristine swimming environment, I find this replacement grid assembly to be not only practical but essential for optimal pool performance.

The first thing that caught my attention about this product is its comprehensive set of features. The Byenins replacement assembly includes the manifold top, air bleed, complete grid assembly, and grid locator spider. This all-in-one package means that I won’t have to hunt for individual parts or worry about compatibility issues. The convenience of having everything I need in one purchase saves me time, which is especially important during the busy summer months when I want to focus on enjoying my pool rather than maintaining it.

Another standout feature is the ability to replace unwashable grids. If you’ve ever dealt with a dirty, clogged filter, you know how frustrating it can be to try and clean it effectively. This replacement grid assembly addresses that problem directly by providing a new, clean system that restores the efficiency of my pool’s filtration. This is a significant advantage, as it not only enhances the cleanliness of the water but also reduces the risk of pump pressure issues caused by blockages. Maintaining lower pump pressure means that my pool system can operate more efficiently, ultimately saving me money on energy costs.

Installation is often a daunting task for many, but I appreciate that this assembly is designed for easy installation. With clear instructions and a user-friendly design, I feel confident that I can set it up without needing professional help. This ease of installation is a game-changer, as it empowers me to handle the maintenance of my pool independently. Plus, solving filtration problems quickly means I can get back to enjoying my pool without long downtimes.

Moreover, I find that purchasing this complete grid assembly is more convenient than buying single grids. When managing a pool, every little detail counts, and the cumulative effort of purchasing multiple parts can be overwhelming. By opting for the Byenins assembly, I streamline my purchasing process and reduce the hassle associated with it. This thoughtful consideration of user experience makes it easier for individuals like me to keep our pools in top condition without unnecessary complexity.

In summary, the Byenins 36 Sq.Ft. Complete Element Grid Assembly Replacement stands out as a reliable and efficient solution for pool and spa owners. With its comprehensive set of features, ease of installation, and the ability to address common filtration challenges, it’s a product that I highly recommend. If you’re looking to enhance your pool experience and keep your water crystal clear, investing in this replacement grid assembly will undoubtedly pay off in the long run. Don’t miss out on the opportunity to elevate your pool maintenance game—consider making this purchase today!

Feature	Description
Complete Set	Includes manifold top, air bleed, complete grid assembly, and grid locator spider.
Replacement	Replaces unwashable grids for better efficiency.
Pressure Management	Helps solve high pump pressure issues due to filter blockage.
Easy Installation	Designed for straightforward setup, no professional help needed.
Convenience	More convenient than buying individual grid parts.

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3. Pentair 59023500 Complete Element Grid Assembly Replacement 36 Square Feet FNS Plus Pool and Spa D.E. Filter, Black & white

I recently came across the Pentair 59023500 Complete Element Grid Assembly Replacement, and I must say, it truly stands out as an essential component for anyone who owns a Pentair 36-square feet FNS Plus pool and spa D.E. filter. When it comes to maintaining a clean and pristine swimming pool, the quality of the filter system cannot be overstated. This product is specifically designed to enhance the performance of your existing filtration system, ensuring that your pool water remains crystal clear and free from debris.

The standout feature of this grid assembly replacement is its complete element grid design. This means that it comes as a fully assembled unit, making the replacement process straightforward and hassle-free. If you’ve ever tried to replace individual components of a filter, you know how tedious and time-consuming it can be. With this product, I appreciate that the assembly is ready to go right out of the box. You can quickly and easily install it, allowing you to get back to enjoying your pool without unnecessary delays.

Another key aspect that I find impressive is its compatibility with Pentair’s 36-square feet FNS Plus pool and spa D.E. filters. If you’re a proud owner of one of these systems, you can rest assured that this grid assembly is designed to fit perfectly. This compatibility not only simplifies the replacement process but also optimizes the performance of your filter, ensuring that it works at its best to keep your pool water clean and inviting.

In terms of dimensions, the assembly measures 18-1/2 inches in length, 25 inches in height, and 18 inches in width. These measurements are ideal for the corresponding filter system, ensuring a snug fit that enhances filtration efficiency. I find that when components are engineered to fit precisely, it reduces the chance of leaks or inefficiencies, which can be a significant concern with pool maintenance. With this product, I feel confident that I am investing in a reliable solution that will maintain the integrity of my pool system.

For those of us who value both time and quality, investing in the Pentair 59023500 Complete Element Grid Assembly Replacement is a wise decision. It not only saves time during installation but also ensures that I am using a high-quality replacement that can handle the demands of pool maintenance. The peace of mind that comes with knowing my pool’s filtration system is in top shape is invaluable.

If you’re considering a replacement for your D.E. filter, I encourage you to look closely at this product. It’s not just a purchase; it’s an investment in your pool’s cleanliness and your family’s enjoyment. Don’t let poor water quality be a factor in ruining your summer fun. Grab this assembly replacement and see the difference it makes for yourself!

Feature	Description
Complete Element Grid Assembly	Ready-to-install unit for easy replacement
Compatibility	Fits Pentair 36-square feet FNS Plus pool and spa D.E. filters
Dimensions	18-1/2″ L x 25″ H x 18″ W

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4. DPM Swimming Pool DE Filter Replacement Grid for Pentair FNS Pool Filter Made in USA 7 Large +1 Partial | Replacement for PG-1903 FG-1003 59001700 59001800 FC-9430 FG-1903 (36 Sq Ft (18 inch Height))

When I first came across the DPM Swimming Pool DE Filter Replacement Grid, I was genuinely impressed by its quality and specifications. Designed specifically for Pentair FNS Pool Filters, this product is not just an ordinary replacement; it’s a significant upgrade to the filtration system of any pool. The fact that it is made in the USA adds an extra layer of trust and reliability, something I always look for when investing in pool maintenance products.

One of the standout features of this replacement grid is its size. With seven large grids plus one partial grid, it offers a total filtration area of 36 square feet, which is quite substantial. This means that my pool will have improved water clarity and cleanliness, as the larger surface area allows for better dirt and debris capture. The 18-inch height of the grids ensures that they fit perfectly into my existing Pentair FNS system, making installation a breeze. I appreciate how easy it is to maintain a healthy swimming environment with such a well-engineered product.

Another reason why I feel confident in recommending the DPM DE Filter Replacement Grid is its compatibility with various Pentair filter models, including PG-1903, FG-1003, 59001700, 59001800, FC-9430, and FG-1903. This versatility means that whether I have an older or newer model, I can rely on this replacement grid to fit seamlessly. It eliminates the hassle of searching for multiple products or worrying about whether something will fit properly. For anyone who has struggled with poor-fitting replacement parts, this is a major relief.

Moreover, the efficiency of a DE filter is well known among pool owners. By choosing this replacement grid, I know that I am investing in a system that will enhance water clarity and reduce the frequency of cleaning cycles. This not only saves me time but also reduces wear and tear on my pool equipment, leading to longer lifespans and lower maintenance costs in the long run. It’s a win-win situation that I believe every pool owner should consider.

Lastly, I want to touch on the overall value of this product. Given its quality, compatibility, and efficiency, I believe that the DPM Swimming Pool DE Filter Replacement Grid offers an excellent return on investment. Pool maintenance can often be an expensive endeavor, but with this replacement grid, I feel like I am making a smart choice that will pay off in the long run. For anyone looking to improve their pool’s filtration system, I would strongly encourage you to consider this product. It’s time to upgrade your pool experience!

Feature	Details
Product Title	DPM Swimming Pool DE Filter Replacement Grid for Pentair FNS Pool Filter
Made In	USA
Grid Count	7 Large + 1 Partial
Filtration Area	36 Sq Ft
Height	18 inches
Compatible Models	PG-1903, FG-1003, 59001700, 59001800, FC-9430, FG-1903

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How Pentair FNS Plus 36 Filter Grids Helped Me Maintain a Pristine Pool

As a pool owner, I’ve always prioritized keeping my swimming space clean and inviting. When I upgraded to the Pentair FNS Plus 36 Filter Grids, I noticed a significant difference in the clarity of my pool water. These filter grids are designed to provide superior filtration, capturing even the smallest particles and debris that other systems might miss. I found that my water not only looked clearer but felt fresher too, which made swimming much more enjoyable for my family and me.

One of the standout features of the Pentair FNS Plus 36 is its ease of maintenance. I’ve had experiences with other filtration systems that required constant attention and complicated cleaning processes. However, with the FNS Plus, I can easily remove and clean the filter grids, making upkeep a breeze. This efficiency has saved me both time and effort, allowing me to spend more quality moments with my loved ones by the pool rather than worrying about maintenance.

Additionally, the durability of these filter grids is impressive. I’ve found that they stand up well to the rigors of regular use, which means I don’t have to replace them as frequently as I did with previous filters. This longevity not only

Pentair FNS Plus 36 Filter Grids Buying Guide

Understanding the Importance of Filter Grids

When I first ventured into pool maintenance, I quickly realized the significance of having a reliable filtration system. The filter grids in my Pentair FNS Plus 36 play a crucial role in keeping my pool water clean and clear. These grids help to trap debris and contaminants, ensuring that my swimming experience is always pleasant.

Identifying the Right Size

Before purchasing filter grids, I made sure to verify the size that fits my Pentair FNS Plus 36. It’s essential to check the specifications to ensure a proper fit. I found that the size not only affects the efficiency of filtration but also impacts how often I need to clean or replace them.

Material Matters

The material of the filter grids is something I paid attention to. I learned that high-quality materials can enhance durability and performance. I found that the right material helps resist wear and tear, allowing my filter to function optimally for longer periods.

Checking the Number of Grids

My Pentair FNS Plus 36 system requires a specific number of grids for efficient filtration. I made sure to confirm how many grids I needed before making a purchase. Having the right quantity ensures that my pool can filter water effectively without overworking the system.

Compatibility with My System

Compatibility is a key factor I considered. I took the time to check whether the filter grids I was looking at were specifically designed for the Pentair FNS Plus 36. Using compatible parts ensures that my filtration system operates as intended, preventing any potential issues down the line.

Installation and Maintenance

I found that installation is relatively straightforward, but I made sure to read the instructions thoroughly. I also learned the importance of regular maintenance. I plan to check and clean my filter grids regularly to ensure peak performance. This practice not only extends the lifespan of the grids but also keeps my pool water crystal clear.

Understanding the Cost

Budgeting for filter grids is essential. I compared prices and considered the long-term value rather than just the upfront cost. Investing in high-quality grids may mean spending a bit more initially, but it often pays off in terms of durability and efficiency.

Reading Reviews and Recommendations

Before finalizing my purchase, I took the time to read reviews and recommendations from other pool owners. Their experiences helped me gauge the performance and reliability of various filter grids. I found that real-world feedback is invaluable when making informed decisions.

By considering these factors, I feel confident in my ability to choose the right filter grids for my Pentair FNS Plus 36. Taking the time to research and understand my options has made a significant difference in my overall pool maintenance experience. I look forward to enjoying clean and refreshing water all season long.

Author Profile

Mike Nielsen

Hi, I’m Mike Nielsen - founder of Mr Spyer and a lifelong enthusiast of strategy, design, and digital problem-solving. Over the years, I’ve worn many hats in the tech space. The name “Mr. Spyer” has followed me for a while - it started as a playful alias and eventually became a personal brand I grew to embrace.

In 2025, I decided to pivot. Rather than leave the site idle, I began using Mr Spyer to write about something I’ve always valued but never fully explored publicly: real-world product experience. Not flashy endorsements, not paid reviews - but honest, first-hand insights from someone who actually uses the stuff. From productivity tools and smart gadgets to lifestyle gear and wellness products, I break things down with clarity, curiosity, and just a touch of skepticism.

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