overnight fc loss

I have a 14k gallon inground, covered pool. The water is crystal clear, and there is no visible algae. However, the pool will not hold chlorine, and I am losing CYA over time (without water changes). Based on this article (poolsolutions.com...), I have been under the belief that some kind...

Hello again, This last weekend I changed the sand in my filter, retightened all the connections, and drained and replaced more than half the water (removing algae and higher copper levels from previous system). I tested the water Saturday afternoon and continued with SLAM. FC 8 CC .5 PH 7.2...

I've been sitting in the back pew of the Church of TFP for a few years and just moved down to the front pew. Now, I want to make sure I'm singing out of the correct hymn book. (Eye rolls are OK from anyone not from Texas or the South :)) Background: A few weeks ago, my pool was Army green --...