This house I’ve recently moved to has a pool, built in spa, and a pond with two water features. In the pic above, the cartridge filter and heating unit are to the left while the sand filters for the pond are to the right. The L pipe coming out of the ground just left of the “o/flow” pipe is labelled “Vac” but is hidden behind the valve.
Which valves do I need to close before vacuuming?
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