I have my water tested at a reliable pool store. They have a great reputation and I trust their results. When I opened the pool a month ago I had them test the water. They found high nitrates, which I corrected by draining. They also found high phosphates. I have gone through three bottles of Phos Free and the phosphate level does not seem to decrease. The recent advice was to change the sand in the filter, which was somewhere between 7 and 10 years old. I did this yesterday.
The problem I am seeing is that when using Phos Free the filter should get filled with the phosphates and this will increase the pressure gauge. My pressure gauge typically holds steady at 12 and even with the Phos Free it does not increase after running for 48 hours. Any advice here? Is my filter just not cutting it? Any other approach to getting rid of phosphates?
The problem I am seeing is that when using Phos Free the filter should get filled with the phosphates and this will increase the pressure gauge. My pressure gauge typically holds steady at 12 and even with the Phos Free it does not increase after running for 48 hours. Any advice here? Is my filter just not cutting it? Any other approach to getting rid of phosphates?