Need a little help here. First season operating a pool. All seemed to be going well until this week. I have been testing regularly (TF100 kit) and have had some issues maintaining a consistent chlorine level, but have been in range for the most part. Earlier this week the pool started to cloud up a bit and I had not shocked it for a while so last night I dumped in 3 lbs of lithium based shock. It was late and I did not get a chlorine reading after the shock, nor did I this morning (an obvious oversight/mistake).
I just tested the water after work and below are the reading I have. I was completely surprised to see a big fat 0 chlorine. The even more surprising part is that in the last 5 days my CYA has gone from a solid 30 to below 20. I run trichloro tabs as this was a new fill this year and decided to use those to elevate my CYA levels and provide consistent chlorine until everything stabilized. Not sure if that is the right logic, but that is how I tackled it.
I did look today and the tablets in the chlorinator are pretty much dissolved so I filled it back up and added an extra in the skimmer to start boosting chlorine and CYA.
I am open to advice here.....why would my chlorine be 0 with a chlorinator and after shocking last night? Also why would I have lost CYA? It has been hot and sunny here 95+ for the past week or so, so I expected to lose chlorine but not CYA.
My plan now is to shock it again tonight with at least another 3 lbs (21000 gal pool) and hope the CYA rises with the fresh stack of 8 tablets in the chlorinator. However as I said I am new to this and need advice. I want to get the pool in tip top shape before the 4th weekend when we will have folks using it a lot.
Help please! Below are the reading as of this evening after shocking last night..... Thank you - Ryan
FC - 0
CC - 0
CH - 300
TA - 250
PH - 7.5