black algae on calciaum

[Mr2005]

just above my water line, i have some build up of white scale which i believe is calcium on my pebble tec. on that build up i have black splotches that turn bright green when the chlorine dips a bit. then i typically raise the water line to cover the green then boost the chlorine.

i was told this was black algae at my neighborhood pool store. it was recommended i let the water line drop then attack the build up with a pumice stone to remove the build up and ultimately the black algae.

just wanted to get a 2nd opinion on the best way to remove the build up and also the black algae?

thanks,

 

[duraleigh]

It sure sounds like you have algae and calcium scale. Whether it's black algae or not, the conditions that have caused it will return unless you get your chemistry in check.

I would do that first and then clean up the scale.

 

[JasonLion]

If you post a full set of water test results, we can give you much more specific advice.

 

[Mr2005]

hi jason,

my water test from yesteray at leslies pool store
free chlorine 4
total chlorine 4
Salt 2600 ( irrelevant because my salt cell is dead, using chlorine tabs)
cyanuric acid 99
total alkalinty 80
pH 7.4
phosphates 200


since the test they had me add 9 oz of phosfree.