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Excellent answer Robco, One slight variation of an explanation about "waste"...
When in this mode, water never actually enters the filter tank, it goes in the valve from the pump, and out of the valve through the waste port.
Very similar to the "recirculate" mode, it comes from the pool with the help of the pump into the filter valve, and right back out the filter valve, without ever going into the tank, and back to the pool via the return port.
Hi. Have you disassembled the multiport valve recently? If so, then the diverter and or handle was improperly aligned.
If all other functions work as they should (waste, backwash, recirculate,rinse or closed then there is an issue with a worn diverter (or spider gasket) or the diverter valve stem is hanging up slightly. valve top would need to be disassembled and lubed.
hope this helps.
All hayward stickers are replaceable at you local hayward retail store but easy way to know where backwash is usually the bottom of dial usually patent number is at bottom, Filter at 12 o'clock, waste at1 o'clock, backwash at6 o'clock, recirculate at8 o'clock rinse at10 oclock
Reference your pressure gauge as the 12:00 position. Going clockwise- 12:00 is Filter, normal running position 2:00 is Waste, water goes from pool and exits the waste line, bypassing filter. 4:00 is Closed, used only when servicing equipment 6:00 is Backwash, reverses water through the filter and goes out the waste line. 8:00 is Recirculate, water bypasses filter and returns to pool. 10:00 is Rinse, water goes through filter and exits to waste line, used briefly after backwashing to clear sediment from filter. Note that the "pointer," not the handle that you grab, indicates which setting you are on.
If you know how to place the valve into the backwash and filter positions you need to use these. The others are important at times but they are not as important. In fact another type of backwash valve has only two positions. This valve is one of the most popular valves for this function so it must not be too bad. I hope this helps.
Normally, you set your pool filters setting to "filter" when you vacuum. Is this the setting you are using? If that doesn't seem to be working or your pool is especially dirty, change the valve to "waste" and operate with the cleaner on that setting. That will bypass your filter entirely. If this works, it could be that your filter is dirty and needs to be backwashed or have the sand changed.
Replace the internal "wagon-wheel" looking gasket inside the valve. Its job is to keep the water going thru the valve and ports the handle is set to and not leak out of the waste port.
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