Ok, if it's calcium, do this;

1. Get the K2006 kit (links in my sig) and get test results on BOTH your pool, and your fill water. Do NOT test the fill water for CYA; there's none there and there are only a few CYA tests in the kit. The links go to Amazon, but if you want to look elsewhere you are looking for a Taylor FAS-DPD K-2006 kit -- do NOT get a K2005! The lowest prices I've heard of are $47 plus shipping; typical low price is about $53 + shipping. It is VERY rare to be able to buy one locally.

2. Post the exact info on your pump and filter -- there's a high chance your pump is significantly too big for your filter, and besides wasting electricity, this causes filtration problems.

3. Let us know (add to your signature) any other equipment you have: SWCG, heater, spa, etc.

4. Tell us EVERYTHING you are using to treat your pool water.

There's a fair chance that you can strip the scale into the pool water . . . if you can raise your water level a bit. But setting that up requires exact knowledge of what's in your pool, and what equipment you have.