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You would think so, but I feel it's leaching from between the tile (grout=porosity) and only being deposited on the glass surface. I'ts very common in Latin america where they opt for glass tile on many architectural builds and pools; combined with less than favorable concrete blends it's...

..another vote for efflorescence. It's originating from the cement/mortar not the pool water.

I'm fairly new as well and learning some of the terminology check out this thread: http://www.troublefreepool.com/threads/87968-White-scaling-on-my-new-waterfall-amp-disagreement-amount-chemical-levels Maybe the same type carbonate build-up from the mortar/cement.

Re: thoughts on bio-active cya reducer Very interesting product indeed. A few ounces of that magic would allow for use of pucks on extended vacations. Thanks for posting XpertPool.

Excellent thread~Thank you! I'm in SE Texas and also experienced CYA loss more >3PPM/month. Some general comments from others on this forum had me double checking my methods and numbers (even tossed some of my reagents). I now supplement my Clorox regime with pucks (in-line set very low) and...

Interesting indeed! I'm familiar with the concept of managing natural filtration, but on a much smaller scale; aquariums (both fresh and saltwater-reef). I guess the larger scale nitrogen cycle management would be a waste treatment plant? My initial thoughts would be the build up of organics...

1st try pressure washing. If that doesn't help, test a small section and use HCl (muriatic acid); an all plastic spray bottle works best. Use caution with the HCL and rinse the area well after applying.