Question about Hayward SAND FILTER, PRO SERIES

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I can not get vacuum pressure on my Hayward Sand Filter. I am using the Aquabug auto vacuum(which I've used over the last three seasons). When I fill the hose and put it into the skimmer port, I lose outflow pressure and then bubbles intermittenly come out of the outflow with very reduced pressure. There seems to be air trapped somewhere?? I have opened the waste cap at the bottom and let the filter drain out water. I also; backwashed, rinsed, recirculated and waste ran the filter, but still have the same issue. Thank you!!

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  • eng62rules Jul 20, 2009

    Thank you XPoolGuy. I just went out and there was a leak coming out of the strainer cover. It is definately the o-ring.
    I appreciate your time.

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The filter is most likely not the issue at all.
When you lose vacuum pressure and see bubbles the problem is usually air getting into the line killing the prime. The most common place that air gets into the line is from the strainer cover on the pump. The clear lid on the front of the pump has an o-ring that after 3 years is probably due for replacement.
With a bad o-ring it's easier for the pump to draw air through the lid then water through 20+ feet of vac hose. Replace the o-ring, make sure it is lubed well with a non petrol based grease.
The only other issue that may cause this is a cracked or seriously warped strainer lid, which should be easy to recognize once it is removed to replace the o-ring.
Once this is done you should be fine.

Posted on Jul 14, 2009

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