Abalone Shell Chips and Brown Stains in Diamond Brite Plaster-

Dram414

Member
Sep 24, 2019
8
Texas
Moved from here... Abalone Shell Chips Causing Brown Stains in Diamond Brite Plaster-


Hi,
Hopefully I can shed some light on your issues. I am ever too familiar with abalone stains. Here is what I have gathered thus far. So, because abalone is a shell and was once alive, they contain certain amounts of protein. If at any time after the installation the water gets aggressive (acidic) the shells become compromised and start to release these proteins. Looks very unsightly, and progressively get worse. I have come across a remedy to this problem that I will be starting today on a local pool that has these stains. I will keep you posted as to how it turns out. Takes about fifteen days and I guess the trick is to not do it too early as to be sure all the proteins have been released from the shells, or the problem just comes back again..
I am having the same problem, can you help me out? My two month old pool looks like Crud, has hundred of dime sized light brown spots, many are surrounding abalone shell, other spots I am suspecting are where some of the hand tossed shell fleks came off and maybe left the protein behind. I have been keeping my PH right at 7.4 since we got it, no metal in the water, no fertilizer, leaves or anything else. The spots won’t scrape off. Oddly a few seemed to improve with muratic acid, others, nada.

My pool contractor says it’s black algae but it clearly isn’t and confirmed by a dozen other pool people.

Any ideas you have would be great!!
 

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Dram414

Member
Sep 24, 2019
8
Texas
One thing you can do is read over this link and follow the recommendations here Stains in Your Pool - Trouble Free Pool Let us know what happens.
The plaster manufacturer says that the problem is as I suspected, the abalone shells in the pool or leaching proteins. They recommended adding 12 pounds of shock two times over a five day window. They recommended increasing my chlorine to 10 ppm. However, my free chlorine levels were already at 16.6 ppm .

Additionally they recommended that I turn off my system and let the chlorine soak in the pool to kill the proteins in the abalone for five days. I am about to experience freezing temperatures and do not think turning off my system for that long is a good idea.

I don’t know if super chlorination my pool is going to fix the problem. And I think I’ll wait till I have a week over 45-55