Help - surface of spa feels like sandpaper. Any ideas why?

I changed the water in my spa about six weeks ago and have been having trouble getting the PH in range. Last weekend I used the spa and the surface feels like sandpaper. The rough surface can rub off but I don't know what has caused this reaction. Any ideas?
Butch

Posted by on 2007-03-06 12:08:15. (9218)

Using calcium hypochorite(pool chlorine) can do it. Also, high ph produces a scaling effect.

Posted by on 2007-03-06 21:32:06. connecticut (9223)

How do you get rid of it. I have the same problem.

Posted by on 2007-04-03 08:52:44. (9498)

lower the ph of the water for several days. Don't go too long with acidic water, can affect equipment.

In a perfect world, you'd plug off all jet and suction openings and lower the ph and install a submersible pump. Run the pump for a few days, moving the water until the scale is in solution, then dump the water and refill.

Posted by on 2007-04-03 10:02:51. connecticut (9500)