Recently found this forum, and I have been trying to follow the TFPC method but I haven't been able to hold any chlroine in weeks. Took water to the guys at the pool store but they tell me I have nitrates and that I have to drain the pool. Do I really need to do this? It seems absurd that there wouldn't be something to fix this. Are they working with the water company? Do I just need to dump more Clorox?