Hello everyone, this is my first post. A couple months ago my girlfriend and I were offered by her parents to rent their old house that has a 25K gallon pool. It took some time but we just now got in here. I have been researching everything I can about pool maintenance, which is how I came across the BBB method. I had unfortunately forgotten about it when we took a sample of our water to the pool store on Saturday and they roped me into buying about $50 worth of extra chemicals. The pool has a sand filter that I can't identify because the labels have all been worn off. The pressure gauge reads 10 PSI and I think my girlfriends father said the "recently backwashed pressure" was about 8 PSI. I guess the best way to do this would be to break down what's been done over the past few days.
Thursday - Girlfriends father added 2 gallons of liquid chlorine (12.5%) to algae infested pool.
Thursday evening - Pool blue and cloudy. Brushed and vacuumed pool and left the pump running all day and all night. Pump automatically shuts off at 4AM.
Friday - Pool still cloudy; turned the pump on around 9AM. Brushed and vacuumed and left the pump running all day and night until auto shutoff at 4AM.
Saturday - Woke up and pool was still cloudy but much clearer; turned pump on around 9AM. Went to the pool store and purchased 4 pounds of CHLOR-BRITE and various other chemicals to clear up the cloudiness. A few minutes after we got home I remembered reading about the BBB method and that essentially you shouldn't be putting anything other than chlorine in the pool to clear it up. I decided to just call it a loss on the other chemicals we bought and not use them, so I just put in the four bags of CHLOR-BRITE. FC level jumped above 10 and killed all remaining algae. Left pool running all day and night again until it shut itself off at 4AM.
Sunday - Woke up to a mostly clear pool and turned on the pump around 8:30 AM. There was still some slight cloudiness left but after about 4 or 5 hours it was completely clear. I checked the chemicals and everything was in a good range and the chlorine was at about 6 or 7 ppm.
Sunday evening - FC levels at about 5 and pool completely clear. I got in and scrubbed down the whole pool with the wire brush and it was looking amazing. I went to bed and the pool was still looking great. Pump automatically shut off at 4 AM.
Monday morning (today) - Woke up to a completely clear and beautiful pool. Checked chemical levels and everything looks good, but chlorine is a bit on the low side 2 - 2.5 PPM FC. Today was the day to get the BBB method into action! Around 11:30AM I went around and turned the pump on. Upon walking back around the pool I could see that the water was turning cloudy from the water from the fountain and aerator. My girlfriends father came over for something and took a look at the pool. His response was to dump 3 gallons of my liquid chlorine (12.5%) into the pool. I told him that it was perfectly clear last night and this morning before turning the pump on, but his reaction is to always dump chlorine in no matter the problem.
I just looked at the pool and it's definitely not getting any worse, and it might be slightly better.
So that is where I am at now. Could this be a problem with the filter? I don't want to just shock the pool if it's going to do the same thing the next time I turn the pump on.
Sorry, I know this was long but I wanted to be thorough. Thanks in advance!