Hi, I have a 17k gallon in-ground fiberglass Sun pool. Salt Water, Blue. It has a heater. The pool is maintained by a pool service and chemicals are balanced perfectly. The surface of the pool is covered with a film that cannot be brushed off but easily comes off when wiped with your hand, or a cloth. The color is blue. At one time, I thought it was the gel coat, but there is no compromise with the coat’s shine when it is wiped off. At one time, I had the entire pool manually wiped off, and it was beautiful.. only for a few weeks. The manufacturer stated that the issue was a result of environment and chemical balance OR it was because of the pool heater. There is no bi-pass valve to prevent the water from circulating through the heater. I tried to the Metal Removers as well – and that did not work. Do you have any recommendations to remove and prevent this issue? I’ve had the pool for 4 seasons now, and this has been happening since year 1.

Question:

Hi, I have a 17k gallon in-ground fiberglass Sun pool. Salt Water, Blue. It has a heater. The pool is maintained by a pool service and chemicals are balanced perfectly. The surface of the pool is covered with a film that cannot be brushed off but easily comes off when wiped with your hand, or a cloth. The color is blue. At one time, I thought it was the gel coat, but there is no compromise with the coat’s shine when it is wiped off. At one time, I had the entire pool manually wiped off, and it was beautiful.. only for a few weeks. The manufacturer stated that the issue was a result of environment and chemical balance OR it was because of the pool heater. There is no bi-pass valve to prevent the water from circulating through the heater. I tried to the Metal Removers as well – and that did not work. Do you have any recommendations to remove and prevent this issue? I’ve had the pool for 4 seasons now, and this has been happening since year 1.

Answer:

An automatic or robotic cleaner may be helpful to constantly brush the walls and floors for you. Additionally, you may try a phosphate remover to see if the substance is algae related (such as blue-green algae or slime). When there is no food in the water, there is no food for the algae to grow.