Bottom of the Pool Gets Dark

by Jon
(Hamden , Connecticut)

I have had my above ground pool for 5 years. I check the water and add the appropriate chemicals regularly. Although the water is clear...the bottom of the pool becomes very dark. Vacuuming doesn't help. when I at times use PH de-creaser, the pool bottom returns to it's regular appearance but only in the areas where the chemical has touched it. The bottom then has a swirl look...where some of the ph de-creaser has touched the bottom and other spots where it hasn't, from the swirling water from the filter. When I put the winterizing chemicals in the pool at the end of the season, by the next time I reopen the pool , the bottom is spotless once again but a month or two later it begins to darken again. No one else I know has this problem. I know it's not really a pool part problem but I thought someone might know what might be going on with the pool.

Hi Jon. It does sound a little strange, hopefully someone else has had this problem and can help out.

Whatever chemicals you are using, I would try something else. You might also try shocking the pool every couple of weeks, if you do not already.

You could also try running the filter for longer periods of time and see if this helps. Try having your water tested at several different pool stores and see if their advice differs. You might learn or come up with something new.

Hope something works.