I'm thinking the tarp cover has a few small holes and some leaves got in too. Plus I know I sucked alot of the treated water out through the course of sucking water off the cover throughout the winter. Guess It'll take a longer SLAM to start the season. If my cya is 0 barely registering, it is ok to add it while I'm slamming correct? I'm adding 5 lbs of stabilizer as I type this. Should bring it to 20ish.