Been lurking for a year and a half. Ever since we got our pool. The knowledge on this site is incredible. Ive never needed to ask a question before because I always found the answer just by searching. I have and use the TF-100 test kit and I started reading this site during our pool build and my pool always has been trouble free. It still is I guess but I have noticed a change.
The problem is that the water is slightly cloudy. I can only notice it at night near the lights. There is a haze in front of the lights that seems to be made of fine particles. This is new to me. My water has always been crystal clear. I have also noticed that my SWG is having a harder time keeping up with chlorine demand. My pool always runs 24/7 and normally a setting of 10% on the SWG maintains a FC level around 5. In the summer with kids swimming I would be around 15% to maintain the same level. Currently I am at 30% and FC is hovering around 3-4. We just finished pollen season and last year all I did was bump up the output on the SWG slightly and clean the filter and that took care of it. This year I did the same but still have the cloudiness. So I decided to shock just in case I was seeing the beginings of an algea bloom. I raised the FC level to 16, the shock value for my CYA level of 40, for 48 hours. I still have the same symptoms.
My numbers look good I think.
CSI -.11 (pool calculator)
When I say my pool has been trouble free I mean it. Ive only had 2 problems and they were related. The first was Gustav which nailed us and put about 2 feet of debris in the pool and left us without power for 12 days. I cleaned the leaves and branches out, shocked, then vacuumed to waste using a portable pump and all was back to normal. Except for the metal stains that appeared in areas where the calhypo settled on the bottom. Didnt worry about the stains and the pool worked like normal for several months untill after reading everything on here about the ascorbic acid treatment I tried it. It worked great and the stains were gone. So was all of my chlorine. I thought I was bringing it back slowly but after being out of town for a weekend I came home to a green pool. I shocked and cleared the pool and the stains came back but only on the plastic jets and drains. We were in the middle of pollen season so I waited to clean the filter. Ever since then I have noticed the cloudiness at night and the higher chlorine demand. This is when I cleaned the filter and shocked as described earlier.
At this point I am wondering.
Did I damage my SWG with the ascorbic acid treatment? I inspected it at the last filter cleaning and it looks perfect.
Did I contaminate my cartridge filter with the treatment?
Have I just not shocked long enough or high enough? Its hard for me to want to raise the FC too high with the pool looking almost perfect and the risk of metal staining.
Any help or opinions would be greatly appreciated.