Quote Originally Posted by MartyW View Post
I had already put 5 gallons in around 9:30 pm before I saw your last post. At 10:30 pm I read FC @ 17ppm and CC @ 4ppm. At 6:30 am I read FC @ 1ppm and CC @ 1ppm. This evening was FC @ 0 and CC @ 0.5ppm.
With a FC of 17, and a CC almost 25% of that, something's eating it up. May or may not be ammonia, but either way the pool still needs shocking.

Edit: Pooldoc's post button works faster than mine tonight!