Tho we've drained, ahh-somed, never let FC get to 0 and have switched from dichlor to bleach (8.25%), I still think we're using more FC than we should be. One thing I've found is that the FC doesn't go up as high as it should when we doze based on pool math so we've taken to dosing after a soak (or a non soak day) but then testing to know actual level after a pump cycle.
We haven't been in since the 31st of July but the following are recent test results:
So over 50% in 25 hours
Thought we'd be going in last nite so I didn't add anything. Didn't go in so at 9:30 last nite (8/2 - 7.5 hours after last test), the FC was 0.8 (a loss of 0.4)
Add 5oz of 8.25% which should have raised 500 gallons 6.6ppm on the FC. We've also decided we have more than the published 500 gallons in there and will confirm for sure when we next fill since I got a gauge for the hose. Anyway, put in the 5oz at 10pm last nite, ran a pump cycle and retested, and FC was 6.2 (vs the expected 7.4) Fine, weaker bleach, more water... we can live with that.
10am this morning 8/3/15, I tested and FC is 3.8 and CC is 0.2
So what the heck? In 12 hours with no bather waste to clean up, we lost 39%
Is it possible that my ClearRay (UV) is causing a higher than normal FC loss like an ozone system would?