As time goes by, the filter media (DE powder, filter sand, or the filter cartridge) breaks down and or clogs up, and may indicate that it's time to change the filter media. If you find your self having to backwash your filter every week, you probably need to replace the filter media, assuming that your filter is properly sized.
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In DE and sand filters, problems with the filter valve (multiport or slide), can cause water to bypass the filter. Internal problems (broken, missing or misaligned filter parts) inside a filter tank can cause water bypass on all pool filter types, and an oversized pool pump can push the dirt right through a filter.
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.
Sand is passing into the pool or out of the filter during the backwash cycle. Damaged or worn o-rings/gaskets The "spider" gasket in the base of a multiport valve, or the o-rings or pucks in a push-pull piston type backwash valve, may need to be replaced.
When a Hayward multiport valve starts to age different problems can arise, some are just annoying and some are actually detrimental to the filter system working properly. And in other instances I've seen multiport problems occur from an incorrect valve installation on a sand or DE pool filter.
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The Swimming pools sand filter troubleshooting and repair guide below will help you diagnose and repair the most common problems on almost all brands of sand filters. You can repair your sand filter with a basic socket set and some standard hand tools.
You need to have the best information, tips, and maintenance tips for your inground and above ground pool sand filter. Troubleshooting a swimming pool sand filter, unlike a torn pleat in a cartridge filter or a torn grid in a DE pool filter, might be hard to find.
One of the most common problems pool owners run across when maintaining and serving their swimming pool is a leaking backwash valve. The backwash valve is the valve which is mounted on either the top or side of your filter tank and are specifically used clean sand filters or DE filters.