• Pentair 59023400 Grid Assembly FNS Plus 48
  • Pentair 59023400 Grid Assembly FNS Plus 48 (4 Features)
  • Pentair 59023400 Grid Assembly FNS Plus 48 Key features/ 3 specs
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Pentair

Pentair 59023400 Grid Assembly FNS Plus 48

Pentair 59023400 Grid Assembly FNS Plus 48

$424.99 USD
$424.99 USD
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When your pool water won’t stay clear even after cleaning your DE filter, worn grids could be the problem. The Pentair 59023400 Grid Assembly is a complete OEM grid set designed for the Pentair FNS Plus 48 DE filter. This filter grid assembly cycles thousands of gallons of water, all while filtering it with Diatomaceous Earth. Additionally, Shasta Pool Supply offers competitive pricing on OEM Pentair grids, making this replacement an effective choice.

What does the Pentair 59023400 grid assembly replace in an FNS Plus 48 filter?

The Pentair 59023400 grid assembly replaces the entire internal grid pack inside a Pentair FNS Plus 48 DE filter. It includes all matched grids assembled to the manifold, which ensures proper alignment. This complete replacement eliminates guesswork and helps the filter trap fine debris down to DE-level micron filtration.

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Key Features

  • Complete Grid Assembly: Includes all required grids assembled for proper alignment
  • OEM Pentair Replacement: Designed to meet original factory specifications
  • High-Efficiency Filtration: Captures fine debris for clear, polished water
  • Durable Fabric & Frame: Built to withstand repeated cleanings and chemical exposure
  • Time-Saving Install: Eliminates the hassle of replacing individual grids

Technical Specifications

  • Type: DE filter grid assembly
  • Application: Diatomaceous Earth (DE) pool filters
  • Installation Location: Inside filter tank
  • Includes: Full grid set (pre-assembled)

Specs

  • Part Number: 59023400
  • Manufacturer: Pentair

Expert Comparison & Pro Tips

Replacing individual grids can lead to uneven wear and poor alignment, especially in older filters. The Pentair 59023400 grid assembly ensures every grid is matched and seated correctly, improving flow distribution and filtration efficiency.
Pro Tip: After installing a new grid assembly, always recharge with the exact DE amount specified for the FNS Plus 48. Overcharging can raise pressure, while undercharging reduces filtration effectiveness.

Our Expert Verdict: The Fastest Way to Fix an Underperforming FNS Plus 48

In real-world pool service, the Pentair 59023400 grid assembly is often the most efficient solution when an FNS Plus 48 starts struggling. It eliminates piecemeal repairs, restores reliable micron-level filtration, and extends the life of the filter tank. With OEM Pentair construction and a factory-fit design, it’s a dependable upgrade that delivers immediate results. Order from ShastaPoolSupply.com for fast shipping, expert support, and confidence you’re getting the correct grid assembly the first time.

How do you know when the Pentair 59023400 grid assembly needs replacement?

If you notice DE returning to the pool, torn grid fabric, rapid pressure rise after cleaning, or cloudy water despite proper chemistry, it’s a strong sign the grid assembly is worn. Replacing the full 59023400 grid pack restores proper filtration and helps your FNS Plus 48 perform the way it was designed to.

Best For: Full DE Filter Rebuilds & Performance Recovery

The Pentair 59023400 is best for pool owners and service professionals servicing an FNS Plus 48 filter with torn, brittle, or clogged grids. It’s ideal when multiple grids are failing, DE is returning to the pool, or pressure rises quickly after cleaning. If only one grid is damaged, a single replacement may work—but when several are worn, a full assembly is the smarter long-term fix.

Best for:

  • Pentair FNS Plus 48 DE filters
  • Recurring cloudy water or DE blowback
  • Faster, cleaner filter rebuilds

Not ideal for:

  • FNS Plus 36 or 60 models
  • Non-FNS or non-DE filters
  • Minor repairs involving only one grid

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What our customers are saying

Exactly what I ordered, package arrived in a timely manner and the quality was excellent.

Tera B

Easy to order and arrived on time.

David F

Fast pickup. The guy who helped me had a great attitude!

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