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To avoid chlorine and electricity consumption, from early September to late October, I keep my pool covered with a black pine needle net. This is a tightly woven polyethylene which allows rain water through, but eliminates all light entering the pool, stopping algal photosynthesis. Providing the pool was properly chlorinated before the pump shutdown, the pool water and pool bottom remain pristine. When I go on month long trips, I use the same approach; the pool temperature will drop to the surrounding soil temperature (in the inground case), in my case around 15 C. When you are away, this is the most foolproof approach to keeping the pool water clean.
If you want to keep appreciating the water surface, have you tried a pool pump timer? Most pools only need to be circulated 8 or so hours per day in the summer. You need to buy a 15 A timer, for a 1 HP pump. Hydro Québec has an ongoing rebate program on these timers, maybe BC Hydro has something similar.
 
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