I have the 48 cell running at level 2 with 20% output, sun all day with direct sun about 8 hours of that. I run the pump 10 hours in 2 stages- 8 hours and 2 hours. I like to run it for 2 hours after we close up for the night. My FC in the ps234s test is always at 4-5. Tests at questionable pool stores(see my post in "Testing and Adjusting Pool Water Chemistry") have me at 3-3.5 which is fine too.
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