10% sodium hypochlorite is just fine, it's strong bleach. Ultra bleach is usually about 6% sodium hypochlorite, there is some economy bleach that's 3% (it's usually not economical). Pool stores sell Liquid Chlorine / Liquid Shock at 10% sodium hypochlorite or 12.5% sodium hypochlorite. It's OK, the 90% is water and a little salt.
FC of 2.5ppm is getting uncomfortably close to your target minimum of 2ppm. I would add chlorine if I got that close. How about we increase your dose to 4oz dichlor and see how we fare. Please put it in as soon as you can but wait to test until later.
Yep, consistent - a couple days where you're reading CC at 0.5ppm or more. If you have CC in one test then gone the next it's not a concern.
I'd be more comfortable if your FC was staying well above the minimum, let's dose a little more aggressively with 4oz at a time until that gets to be too much.
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