Last year my calcium test said 250, using the Taylor test kit drop test. Since it remained constant I did not bother to test it regularly. I then added some copper algecide last summer. Now my calcium test says 190. I followed the instructions here to modify the test for copper in the water and got the same results:

http://www.taylortechnologies.com/Ch...P?ContentID=70

I don't have a copper test here at home but the pool store test said no copper.

I have two questions -
1. What is going on with my calcium test results?
2. When you add a copper algecide to the pool does the copper stay there forever?
3. Is there anything that causes calcium to go down over time?