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
Sand 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.
- Drain the tank by removing the drain cap.
- Remove the top mounted valve or dome.
- Scoop out, or use a wet/dry vac to remove sand.
- Pour in new #20 silica sand, labeled pool filter sand.
- Replace valve or dome securely, start up filter on Rinse.
Lateral 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.
- Drain tank and remove sand, as described above.
- Fold up the laterals vertically, or unscrew threaded laterals from hub.
- Snap in or screw in your new sand filter laterals.
- Cap the standpipe, and pour the sand back in, or use new sand.
- Replace valve or dome securely, start up filter on Rinse.
Hayward Multiport Valve Repairs
Valve 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.
- Cut pipes with hacksaw, leaving enough pipe to reconnect.
- Unclamp valve from tank, wiggle and pull up to remove.
- Lube o-ring and push new valve on standpipe, clamp tightly.
- Wrap threads 4x with Teflon; screw hand tight, plus 1-1/4 turn.
- Rejoin pipes with coupling or union; using PVC primer and glue.
Spider 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.
- Remove 6 screws around valve lid and pull out key assembly.
- Use small flathead screwdriver to remove all of the old gasket.
- Place small dabs of super glue or silicone in the grooves.
- Press in new gasket, wipe off any excess silicone.
- Reassemble by replacing key assembly in the proper orientation.
Cracked 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).
- Obtain SuperGlue ® or a liquid 2-part epoxy, like Plast-Aid ®.
- Cut pipe on cracked port, or remove gauge and clean threads.
- Thread pipe or gauge into hole to expand crack to it’s widest.
- Squirt expanded crack full of Super Glue or liquid epoxy.
- Quickly remove pipe or gauge; allow glue or epoxy to set up.
Hayward Cartridge Filter Repairs
Leaking 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.
- Cut leaking PVC pipe(s), leaving 2 inches of clear pipe to reconnect.
- Unthread the pipe(s) from the filter in/out port.
- Wrap new Male Threaded Adapter with 4 layers of Teflon tape.
- Screw new MTA fittings into filter body, hand tight, plus 1-1/4 turns.
- Rejoin with pipe, a coupling or union, and PVC primer and glue.
Leaking 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.
- Remove clamp band and top filter half completely.
- Remove belly band o-ring, and wipe clean with paper towel.
- Replace tank o-ring and apply a thin layer of pool lube.
- Replace lid and tighten up clamp band as tight as it will go.
- 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 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.
- Remove wing nuts on top of manifold to disassemble completely.
- Place the manifold upside down on two bricks, facing upwards.
- Start with the partial grid, and push all of the grids into the manifold.
- Place the bottom spreader on top and work it between the grids.
- 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.
DE 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.
- Remove the nuts and bolts around the top, and bump handle pins.
- Remove filter lid, then lift out the entire nest assembly.
- Slide off the tube sheet top, and pull up the damaged flex tubes.
- Push the new fingers in place snugly, replace tube sheet top.
- With nest assembly in place, secure the filter top and bump handle.
A 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!
InTheSwim Blog Editor
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