Usually about 20 minutes. Some weeks a little more. They test the water quality (several different tests), add any necessary items to correct any out of range items. My remote control also tells me things like salt level parts per million and alkaline levels. They use a vacuum on the bottom and a brush around the water line, and a net on the surface. They clean the skimmer filter and/or replace the cloth lining and about every 6 weeks they clean the main filter and in about two years they replaced the main filter.
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Life is to short to drink cheap wine.
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