That's good to know. I'm on a well and have an iron filter and softener before the pool faucet. The CH of that water tests at 250, so I know we're not adding calcium to the water. I have some scale on the liner left over from a major problem two years ago. I'm slowly getting rid of it, but wasn't sure if a lower CH would help. Everything I've read says the only way to lower CH is replacing water.