I opened my pool last week. It is an inground, vinyl, 20,000 pool. It was previously a green swamp, but has improved substantially since. I noticed the last two days though, the rate at which it is clearing up has slowed significantly. I am maintaining the recommended chlorine level for a SLAM. I then read the guidance sheet in the TF test kit and noticed it says that a low calcium hardness can lead to cloudy water, regardless of which type of pool you have. I measured CH at 150 ppm. I bought enough to raise it to 250 ppm and plan on adding it.
The 'recommended levels' page on the Pool School page says to NOT add calcium to a vinyl pool, yet the test kit says that low CH can lead to cloudy water regardless. So what is the consensus on balancing CH in a vinyl pool?