When vacuuming, you leave on the skimmer valve. You apparently close the main drain. What changes when you close the third one?
Re: Clear, but no chlorine???
When vacuuming, you leave on the skimmer valve. You apparently close the main drain. What changes when you close the third one?
26K gal 20x40 rectangular IG vinyl pool; Apr 2014: New pump, liner, auto-cover, & water; Pentair Whisperflo 1HP pump; Pentair Trition sand filter; Cover/Star CS-500 auto cover; Taylor K-2006C; OTO
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