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Pentair Filter Element 2036 / 4036 | 074923

Pentair SKU: 74923

Pentair Filter Element 2036 / 4036 | 074923

Pentair SKU: 74923
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Pentair 074923 D.E. Filter Grid Element (18", Full Grid) for Purex SM / SMBW 36 Sq Ft Filters

The Pentair 074923 is an OEM replacement full-size D.E. filter grid element used in select Pentair / Purex SM and SMBW series D.E. filters. It is commonly listed as an 18" grid element for 36 sq ft filter configurations and is typically sold as one individual grid (not a full set).

Common Compatibility (Verify by Filter Model)

  • Pentair / Purex SM / SMBW 2036 D.E. filters
  • Pentair / Purex SM / SMBW 4036 D.E. filters
  • Commonly referenced as the 18" element for 36 sq ft models

Always confirm your exact filter model and internal grid style before ordering. Some systems use multiple grids and may require a complete set.

Key Details

  • Part number: 074923
  • Part type: Full-size D.E. filter grid element
  • Grid height: 18" (commonly listed)
  • Application: 36 sq ft SM/SMBW filter assemblies
  • Typical quantity required per filter: 8 elements for SM/SMBW 2036 and 4036 assemblies (verify by parts diagram)

What This Part Does

  • Provides the fabric-covered grid surface that holds D.E. powder for fine filtration
  • Helps trap small particles and improve water clarity
  • Restores filtration performance when the original grid is torn, split, or clogged beyond cleaning

Common Signs You Need Replacement

  • Tears, holes, or seam separation in the grid fabric
  • D.E. powder blowing back to the pool after startup (after ruling out manifold/standpipe issues)
  • Grid frame is cracked, warped, or broken
  • Persistent poor filtration or short cleaning cycles caused by damaged grid media

Installation Notes

  • Turn off the pump and relieve all filter pressure before opening the filter tank.
  • Inspect the full grid assembly, manifold, air bleed parts, and standpipe while the filter is open.
  • Replace any damaged grids as needed; many service techs replace the full set when multiple grids are worn.
  • Reassemble carefully so grids seat correctly in the manifold and bottom support.
  • After restart, recharge with the correct amount of D.E. powder for your filter model.

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Maintenance Tips

  • Record your clean starting pressure after each full cleaning and recharge.
  • Clean the filter when pressure rises about 8–10 PSI over baseline (or per your filter label/manual).
  • Inspect grids for small tears during every teardown—catching damage early helps prevent D.E. blowback.
  • Keep water chemistry balanced to help extend grid fabric life.
Questions about returns? View our return policy.

Hours Of Operation:

Monday - Friday: 7:00 am to 5:00 pm Phoenix Time

Saturday: 8:00 am to 2:00 pm

Sunday: Closed

  • We do not ship on Saturday or Sunday.
  • Orders totaling more than $300 will require signature confirmation upon delivery.
  • We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
  • Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
  • Expedited shipping options are available at checkout.

Return Policy:

  • Products that are received damaged will receive a refund in store credit.
  • Most products are eligible for return within 30 days of receipt, except where noted below.
  • To initiate a return, please complete an RMA form prior to sending your item back.
  • Original shipping costs are non-refundable and will be deducted from the return credit.
  • Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
  • Some returns will be charged an automatic 15% restocking fee.
  • We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
  • Please complete the return form to receive your RMA number and return shipping label.
  • Chemical products are not eligible for return under any circumstances.
  • The Pentair Colorsync 618031 is not eligible for return.
  • Pool cleaners are not eligible for return.
  • Opened seals and o-rings are not eligible for return.
  • Capacitors are not eligible for return.
  • Plastic popup tools are not eligible for return.
  • Automation components and circuit boards are not eligible for return.
  • If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
  • Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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