We strictly use liquid chlorine. We seem to lose about 2 ppm per day. I always test the chlorine around 4:30 pm every day and it's almost always down to 3 from our target of 5 (at least I think it's at 3..read on). Now, the problem is my eyes deceive me sometimes where I can't tell if it's at 3 or 4, using the TF-100 kit. I must look at it a million times before choosing which number it's closer to, normally just going with 3 as I feel it's better safe to have a little more chlorine than not enough. I surely don't want to use my FAS/DPD chlorine test for this as it's surely not worth wasting it! Here's my question...If you consistently go over your FC target level every day by a small amount, is there any harm in that? I certainly don't want to over-chlorinate, but I can't imagine that my levels would be that much higher than our target, if at all the way I have been doing it. Just thinking if sometimes my FC is actually at 3.5 or 4, but I am calculating it at 3, can that cause any issues anywhere along the line?
Our CYA is 40, so our target it 5 and minimum is 3.