Hi, Please hang with me as I am a newbie. I am currently reading the pool school. My pool's levels were fine a couple days ago. Today I have no chlorine. Took my water to be tested and they said my nitrates were at 60. They told me to add 4 bags of shock to the pool to see if it would stay. I added the 4 bags at 1pm, at 3 pm I checked the chlorine level and it was off the charts. I just checked it at 7pm and there was no chlorine in the pool again. I really don't know what to do. The pool store near me has already messed me up once. While opening the pool, I was trying to increase my PH and they double dosed me on soda ash, I then had to add the dry acid to get it to correct level. So I really don't trust them much. And we just bought the house and is our first time owning and operating a pool. If anyone could please give some advise on how to get rid of the nitrates without emptying my whole pool, I would so greatly appreciate it. My pool is crystal clear, no algae. We were just swimming in it yesterday, no slippery surfaces, etc. Last week, the pool wasn't using any of the chlorine in the pool, we had chlorine in the filter and wasn't getting used and the chlorine was staying around 2fc 2tc. Within just 2 days the pool won't hold all the chlorine we put in. Sorry if I rambled, I'm just confused and don't really trust the pool company. I don't want to be without using the pool for days or weeks on end.