5-Step Hayward Pool Filter Repairs

DE pool filter cutaway Making your own pool filter repairs is the subject of today’s post.

I’ve outlined the 12 most common repairs that you may need to do at some point to your Hayward filter, or to any pool filter.

Simple hand tools is all that’s required to maintain and repair a Hayward pool filter, along with a few Hayward filter parts.

You also need to know some process about repairing pool filters ~ I hope these 5-step summaries are helpful.

Hayward Sand Filter Repairs

add-new-filter-sand-smSand Change: Replace your filter sand every 5-7 years, or sooner if your filter is undersized, or if it has cleaned up a few algae blooms. Jackie wrote an entire post about how to change pool filter sand, but here’s a 5-step summary.

  1. Drain the tank by removing the drain cap.
  2. Remove the top mounted valve or dome.
  3. Scoop out, or use a wet/dry vac to remove sand.
  4. Pour in new #20 silica sand, labeled pool filter sand.
  5. Replace valve or dome securely, start up filter on Rinse.

hayward-folding-lateral-umbrella-assemblyLateral Replacement: Replace your laterals every 10 years. When one cracks, replace the entire set of  laterals. If sand begins to pour into your pool, the usual cause is one or more broken laterals – here’s how to fix it, in 5-steps.

  1. Drain tank and remove sand, as described above.
  2. Fold up the laterals vertically, or unscrew threaded laterals from hub.
  3. Snap in or screw in your new sand filter laterals.
  4. Cap the standpipe, and pour the sand back in, or use new sand.
  5. Replace valve or dome securely, start up filter on Rinse.

Hayward Multiport Valve Repairs

multiport-valve repairsValve Change: If your multiport valve begins to leak, or the handle loses tension, you could repair it with a new key assembly or a new spider gasket, or you could just replace the entire valve – in just 5-steps.

  1. Cut pipes with hacksaw, leaving enough pipe to reconnect.
  2. Unclamp valve from tank, wiggle and pull up to remove.
  3. Lube o-ring and push new valve on standpipe, clamp tightly.
  4. Wrap threads 4x with Teflon; screw hand tight, plus 1-1/4 turn.
  5. Rejoin pipes with coupling or union; using PVC primer and glue.

white-spider-gasketSpider Gasket Change: Losing water out of the backwash line? Remove the top of the multiport valve and inspect the spider web style gasket. If it’s twisted, broken or worn, here’s how to replace it – 5-step style.

  1. Remove 6 screws around valve lid and pull out key assembly.
  2. Use small flathead screwdriver to remove all of the old gasket.
  3. Place small dabs of super glue or silicone in the grooves.
  4. Press in new gasket, wipe off any excess silicone.
  5. Reassemble by replacing key assembly in the proper orientation.

multiport-valve-leaksCracked Valve Body: If there is a small crack around where the pipes screw into the valve ports, or where the pressure gauge screws in, these were over tightened, or had too many layers of Teflon tape (use 3-4 layers over clean threads).

  1. Obtain SuperGlue ® or a liquid 2-part epoxy, like Plast-Aid ®.
  2. Cut pipe on cracked port, or remove gauge and clean threads.
  3. Thread pipe or gauge into hole to expand crack to it’s widest.
  4. Squirt expanded crack full of Super Glue or liquid epoxy.
  5. Quickly remove pipe or gauge; allow glue or epoxy to set up.

Hayward Cartridge Filter Repairs

MTA-PVCLeaking Pipe Connections: If your filter is leaking where the pipes come in and out, inspect for cracks around where the pipes screw in. If noticed, fill with epoxy as described above. If leaking around the pipes, replace them in 5-steps.

  1. Cut leaking PVC pipe(s), leaving 2 inches of clear pipe to reconnect.
  2. Unthread the pipe(s) from the filter in/out port.
  3. Wrap new Male Threaded Adapter with 4 layers of Teflon tape.
  4. Screw new MTA fittings into filter body, hand tight, plus 1-1/4 turns.
  5.  Rejoin with pipe, a coupling or union, and PVC primer and glue.

hayward-clamp-band-filterLeaking Filter Clamp: For your safety’s sake, when you start up the filter, if the belly band holding the tank halves together or holding the multiport valve is leaking, shut off the pump immediately, and take these 5 steps.

  1. Remove clamp band and top filter half completely.
  2. Remove belly band o-ring, and wipe clean with paper towel.
  3. Replace tank o-ring and apply a thin layer of pool lube.
  4. Replace lid and tighten up clamp band as tight as it will go.
  5. If it still leaks, loosen clamp band, reposition it, and retighten.

Cracked Filter Tank: If your filter tank has a pinhole leak, or a full blown crack, the only repair to make it to replace the filter tank.

For sand filters or older stainless steel tanks, it’s not cheaper to buy an entire new filter, but depending on the age, filter tanks or tank halves can cost 50-80% of the cost of a new filter.

Hayward DE Filter Repairs

de-filter-grids-DE Filter Grid Replacement: Every 10 years or so, DE filter grid fabric starts to break down and develop holes or rips. When one goes, the others will soon follow. Brett wrote a post with great pictures on how to change DE filter grids in 6 easy steps, but here’s the 5-step executive summary.

  1. Remove wing nuts on top of manifold  to disassemble completely.
  2. Place the manifold upside down on two bricks, facing upwards.
  3. Start with the partial grid, and push all of the grids into the manifold.
  4. Place the bottom spreader on top and work it between the grids.
  5. Replace the thru bolts and tighten wing nuts, pulling assembly tight.

DE Manifold Replacement: Another cause of DE powder spilling into the pool is a cracked top manifold, or missing air screen or sock. Follow instructions above for changing DE grids to replace the manifold.

hayward-perflex-nest-assyDE Finger Replacement: If you have a Perflex® DE Filter, you don’t have filter grids, you have Flex Tubes, aka ‘fingers‘. Like filter grids, these deteriorate over time. You can replace just a few if needed, or buy the entire filter nest assembly.

  1. Remove the nuts and bolts around the top, and bump handle pins.
  2. Remove filter lid, then lift out the entire nest assembly.
  3. Slide off the tube sheet top, and pull up the damaged flex tubes.
  4. Push the new fingers in place snugly, replace tube sheet top.
  5. With nest assembly in place, secure the filter top and bump handle.

exclamation pointA word of caution: Filter systems are under pressure and can explode or rupture if clamp bands are not properly installed, or if valves after the filter are closed or pipes plugged while the pump is running. Open air bleeder and all return lines before restarting the pump!

A call to action: Make your own filter repairs with our factory fresh, original Hayward pool filter parts, shipped fast from our 9 parts distribution centers around the country. Besides Hayward parts, we carry filter parts for 20 other brands, old and new!

Give us a call or send an email if you need more information on making your own pool filter repairs, or identifying the correct filter part.

Davy Merino
InTheSwim Blog Editor



5-Step Hayward Pool Filter Repairs — 7 Comments

  1. purchased and replaced a new multiport valve. Valve works good on all settings except backwash and rinse. When on those settings it’s like there is no suction- no water comes out the waste line. Although, when placed on the waste setting, water goes through the waste line fine.

    • Hi Chris, not plumbed backwards is it? The pipe ports labeled PUMP and RETURN, are connected to the Pump and the Return line, no? No extra valve on the waste line that you have to open? Did you disassemble the valve at all (remove the lid or key assy) before installation, and maybe reattached it in a different orientation?
      If not those things, I’m stumped! I’ll keep thinking…

  2. threads on the filter drain are worn,cap dosent seal tight,water drips ,tried plumbers tape didnt help much.any way to rethread them

    • Yes, usually Teflon tape is the trick. Make sure the cap is not cracked. If the threads are molded into the tank, well that’s a problem, unless you have a very large and complete tap & die set. If the drain assembly is removable from the tank, you can replace that part. On some filter drains, you may be able to fit a small expansion plug, like a #2 or #4 winterizing plug, to seal it up – but, it could blow out when the filter gets dirty. You could also plug up the hole with a heavy bead of silicone perhaps, although that may also fail, and end up draining the pool…

  3. I bought this sand filter from in the swim. The seam cracked exactly 1 year and 1week after purchase. I ran pool on bypas for part of last season. I hate to buy another Hayward filter if this is their lifespan. Original filter lasted 14 years and only replaced it because parts for head were no longer available. Would like to repair cracked seam.

    • Hi Clifford, there is no way to successfully or safely repair a cracked filter tank, unfortunately. The problem you have experienced is rare, and is usually caused by a dead-head on the return side (accidentally closed valve), or a pump that is too powerful for the filter size. I couldn’t say that it is a reflection on Hayward quality, their reputation for sand filters is quite good. But filters can fail occasionally. Pentair also makes a fine top-mount filter, with the Tagelus series sand filters, or the Sand Dollar, but I wouldn’t say they are better, or worse – both fine filters.

  4. Pingback: Multiport Valve Settings Demystified: | InTheSwim Pool Blog

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