Politely requested not to add my post to another thread ... so here's a new thread.
I've owned & maintained a 12' x 24' x 5' inground vinyl pool (about 40,000 kiters) for 7 years. In southern Ontario - so a short 3 month season. Varying degrees of success in keeping the pool trouble free over the years, but frankly, haven't had a clear idea of what I've been doing. My wife ("just stick other puck in") hasn't been much help!
This year I rapidly cleared up green water after opening, but then green water started coming back. Shocked it a couple of times & gradually got it back to more or less clear. After a couple more weeks the pool started going cloudy & a bit green again. Since then I have been battling very day to maintain water clarity. I have NEVER used liquid chlorine - only HTH powder in conjunction (sometimes) with pucks. After coming to this site, I have started using liquid chlorine only.
The situation right now: I'm waiting for my testing kit to arrive (should have it on Tuesday). In the meantime I have been adding 1 - 2 liters of liquid chlorine to the pool each night. This has resulted in clear water but always some precipitation of algae at the bottom of the pool ... not a lot, but a light haze of green. My test strips indicate that the chlorine level is between 5 &b 10 after adding the chlorine in the evening & around 5 the following morning. The CYA levels? Hard to say. According to the test strips somewhere above the "ideal" level, but below the 100 level. The last reading from the pool store was 63, FWIW. When I vacuum the pool each morning I do it to "waste", which lowers the water level by a couple of inches, which presumably, is helping gradually lower the CYA level.
Obviously, I need my testing kit to proceed further, but assuming the chemistry is more or less where I think it is, the question I would have is this:
if the pool water is basically clear, but there is some algae precipitation on the bottom of the pool each morning, is it reasonable to continue with appropriate maintenance levels of chlorine in the expectation of gradually eliminating the remaining traces of algae, or is a SLAM required to kill it off completely?