Opening pool this weekend in AZ and it had some slight green algae up the walls in the shaded spots of the pool, plus general cloudy appearance. Not swamp, but certainly a green tint to it. 9ft deep and could clearly see the bottom but not clear by any means.
Starting point was PH at 9, chlorine 0, pump backwashed, vacuum working and all leaves and debris removed from 25,000 gallon pool.
I had a whole load of HTH products so used ph minus and got the PH down to 7.6 overnight while scrubbing the entire pool to loosen all the algae and other dirt.
Backwashed until water was clear (about 1 min) and used 36oz of stabilized chlorinating granules (i did this on a sunny day so maybe that was a mistake) and scrubbed pool again.
Backwashed some green water out. PH was still 7.6, chlorine still registering 0. Pool water had lost a bit of the green tint by now. Added 3 bags of hth shock-n-swim at night just before filter came on. Packaging states 1-2 bags per 11,000 gallons.
Pool is slightly cleaner and the measurements are PH 7.6, chlorine about 1. But it's hardly crystal clear blue lagoon type water, and according to HTH this is the end of the steps needed to clean a pool!
So my questions are
should i continue what i'm doing by adding chlorine and backwashing?
will this get the chlorine level up to 4ppm and change the water to a clear blue color? I have AT LEAST seen the chlorine levels rise to 1ppm with the addition of the shock-n-swim last night, and the pool does look clearer as a result. But i thought shock-n-swim was supposed to get chlorine levels really high then let them drop. My levels went from 0 to 1. Hardly a 'shock' to the pool.
I am curious as to why the chlorinating granules on day2 had virtually no effect on chlorine levels or pool appearance. Does adding chlorine granules in 100deg daytime sun reduce their potency.
Is there some other element to the pool chemistry that is limiting the effectiveness of the chlorine because it should be pretty high by now, instead of being at 1.
Thanks for any help