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    Filter pressure not restored completely after backwash

    We recently opened our pool and SLAMed to completion. We then used a combination of brushing and robot cleaner to get most of the debris out. Last night the filter gauge was reading about 16 psi and we did another brush. This morning the pressure was 26-27 psi when we backwashed our sand filter...
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    Is the top of skimmer housing supposed to be sealed?

    We typically don't keep our pool that high during the summer season, but during Spring when the pool is still closed, rain water usually brings the water level high enough that it may run off from the gap in the picture. Is this by design or would it risk eroding the soil support around the pool?
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    Do I need to patch small hole high up in a vinyl pool

    We have a vinyl pool, and the liner has a small hole (size about the diameter of a pencil) at about a similar height as the top of the skimmer opening (~5.5 inches from the deck). It is almost never under water. Do I need to patch it or can I leave it be? I don't know about the materials behind...
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    What's the purpose of this pressure side pipe (one without a ball valve) and opening?

    You can see that the right-most pipe is split from the return but does not have a ball valve -- what's the purpose of this line? I don't have any water features or pressure-side pool cleaner (I think). I'm also not sure about the opening below. It has a screwed-on cap but when I unscrewed it...
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    Algae killed but water still green

    We often open our pool late (just did it last Sunday) and typically find the water green. We would then use the SLAM method until free chlorine maintains overnight two days in a row. However, the water would still be very green at this point and we cannot see the bottom at the deep end. In past...
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    How to repair (and prevent) small tears & holes in pool cover

    We have a safety cover for an inground pool. Over the winter, heavy snow melting and refreezing caused it to be weighed below the surface and tore up a few holes where the cover contacts the concrete edge. A safety cover seems pretty expensive. Are there ways to repair these? Any tricks to...
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    Pump disconnected, should I cover the pipe open end?

    I'm wondering if there is any consideration whether or not to cover up the openings left by disconnecting the pump & removing the sight glass and pressure gauge on the filter. Should I cover up the pipe and filter holes? If so, what should I use for this purpose? The pool was closed last winter...
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    Fixable -- ball valves cannot close completely?

    The two ball valves connected to two skimmers, circled in red below, become very hard to turn and no longer close completely. As a result, when I try to lower the water level, as soon as it drops below the skimmer, the pump would lose prime. Is it possible to fix these issues with ball valves...
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    Winterizing plugs for Hayward Jet Air III returns

    I think I have a Hayward Jet Air III. When closing the pool today, I realized that the fittings were not installed, but I found a few spare parts that look right here (SP1434-B, SP1434-D, SP1434-T). I used either a size 11 or 12 rubber plug, which got pushed in a little too deep, and I was...
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    Correct pressure (<5psi or ~20psi?) and equipment (compressor/shop-vac/leaf blower) for blowing out the lines

    This is my first time winterizing our in-ground pool. I've read many many articles and forum posts on this topic for the fear that I may overlook something and end up damage the equipment or the underground piping. I have a Freeman 1.5 HP / 6 gallon compressor, a 3.5 HP Shop-Vac, and a Sun Joe...