We have a 15000 gallon fiberglass salt water pool with cartridge filter- we've never had any issues but last week we had tile work done and the water had to be lowered and the pump was off for 2 days. In retrospect perhaps we should have treated the water for this interruption in filtering. On top of that our filter was in need of replacement. We've had pressure issues all summer and have been cleaning it alot.
Fast forward to yesterday and we return from out of town to find it green with algae growing on the walls and ledges. It's cloudy enough I can't see to the deep end. We start filling the pool to run the filter and also at this time we replaced our cartridge in our filter. Our pressures were down to the start. I vacuumed and brushed the sides. Up until this point we had been using test strips and have had nothing but crystal clear water (2nd season with the pool). I keep stabilizer in a sock in the skimmer and I occasionally have to get ph down. It gets minimal to moderate use.
I tested it with a strip -
cya not in OK range but not 0
So I had a bag of shock left from original install of pool and put that in. I went to the pool store to get a better test kit and am now using a taylor DPD test kit. They didn't have DPD powder or reagent but were getting it in today.
Last evening I tested the pool using the drops and the FC was 3-6 and the CYA was ~20 (at 30 I could still see the dot but a little above that the dot disappeared)
I added 187oz of liquid bleach according to the pool calculator. I brushed the sides and walls again and the filter has been on 24 hours as of this morning- I woke up to new algae on the walls and ledges and still cloudy but slightly less cloudy.
I picked up the dpd powder and reagent at the pool store this morning and tested the FC and it was 14.4. My CYA still probably 10-20. I just brushed and vacuumed again, cleaned the cartridge- which again was brand new yesterday but had some green algae on it.
I'm planning to keep testing the FC throughout the day- am I on the right track?
We have a party planned Sunday- is there any chance I will have this in check and the chlorine level will decrease to safe swim levels by then?
Here are some current photos- I am able to see my bottom drains in the deep end but the water is still cloudy with a slightly green tintWP_20150818_11_26_46_Pro.jpgWP_20150818_11_27_03_Pro.jpgWP_20150818_11_27_34_Pro.jpg