Calcium Deposits?

[Jasheon]

WoW, i am filling this forum up with my posts.... .

Anyways, I have always kept my pH levels on the low range in Salt water pools, I have been told to keep it at 7.1 range and I do that.

But i am having a problem with what it looks like Calcium deposits are that developing on the walls of some of my dark bottom pools. I take care of every single pool the exact same, and some dark bottom pools do not have it but others do. I have been taking care of a pool for nearly 2 years then out of the blue these calcium deposits started showing up. I can brush them off with a wire brush or a pumice stone and they come right off. But they keep appearing a week later. I have taken a few pics and curious to hear what you guys have to say.

They mostly develop in the spa (the spa is connected to the pool) then they start going into the pool itself.

http://i35.photobucket.com/albums/d1...Picture011.jpg
http://i35.photobucket.com/albums/d1...Picture010.jpg
http://i35.photobucket.com/albums/d1...Picture009.jpg
http://i35.photobucket.com/albums/d1...Picture012.jpg
http://i35.photobucket.com/albums/d1...Picture008.jpg


Chemical readings (Salt Pool)

FC 4.5
pH 7.3
TA 79
CH 240
Cya 85

I have been told that I need to keep the CYA levels between 60 -80 is that right for salt generators?

Thanks