Right. The opposite of a OCLT. Just remember it's a proportion, not an absolute number. If you lose 4.0 from 10, it's the same as losing 2.6 from 6.5. If your RJ60+ is performing at the same level as mine you will find that starting at 10 you will end up somewhere around 8, which translates to losing 1.25 from 6.5. If that's the case your RJ60+ is generating at the same level mine is, or about 20g per hour.In order to get a better handle on chlorine generation/replacement I guess the next step would be to raise FC level to around 10 in the morning, keep the SWCG off for the day and test in the evening to determine my chlorine loss and that would tell me how much I need to replace during the day to maintain levels. Is this correct? If so I will do this tomorrow and report back.
It seems like 4 ppm loss in a pool with a CYA of 70 is a massive loss of chlorine, especially for NJ latitudes. You're 5° further north than me. My pool is in 100% sun from 7:30 am to 7:00 pm and I only lose 1.8 - 2.0 FC at CYA 50.
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