I have a new pool finished in about August/September. It had two big leaks and was loosing a lot of water every day. The builder would not return to fix the leaks since he had final payment. He thought I was an idiot who could not measure water loss and kept blaming it on evaporation. He is not a reputable or ethical guy at all. After a several months of waiting on him I turned off the pumps and let the pool sit thru the winter since I was spending so much money on water to refill. Finally in March/April I hired a leak detection company to find and repair the leaks, put the chemicals back and start enjoying the pool. I realize it was something I should have “bit the bullet” and hired out when it first happened.
I tell you all that to say the pool obviously got green and gunky. In the early months of having the pool the filter never needed backwashing. I only remember it being done once in the fall since construction was complete.
When I finally got the pool clean and restored the filter seems to get dirty really fast and need backwashing every few days. I back wash when the pressure goes up and I actually notice the return have very little to no water coming out into the pool. My pressure goes up and the flow goes to zero it seems.
I have a Pentair Triton II filter with sand. My pipes are oversized according to the builder. He said he “uses 2” instead of 1 ½ for better flow” and my pump is a Pentair Intelliflo 4x160. This pump is adjustable for RPM’s so the flow can be controlled.
After a backwash cycle the water really ripples coming out of the returns on the lowest pump setting. After a couple of days you can not see OR feel the water even coming out of the returns. When I backwash it immediately gets back to normal.
1)Why is the filter getting dirty so fast? I have nothing around the pool to dirty the water and the water is really clear.
2)Could the filter have some gunk/algae/funk that is not really washing out on the backwash cycle?
3)Is a chemical cleaning of the sand needed? What product to use, how?
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