I tested my CH level last weekend (among other levels) and it was ~130 so I added some CaCl and re-tested yday and it was ~170. So I added more CaCl to get the level between 200 and 300. I will re-test in a few days to see where CH is. But ever since we began using the pool in July 2012 I find myself always having to add CaCl, which as I understand it is not normal. I would think after awhile the CH level would stabilize and I wouldn't need to continually add CaCl.
Are there any ideas as to why I can't maintain CH above 200 consistently? It's a "standard" plaster pool, per my signature.