Salt Water Pool and Expensive Bluestone Patio

Gottabewet

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Silver Supporter
Jun 18, 2018
49
Hudson Vally NY
Nor sure which section to post this.

I have a large bluestone (thermal trublue) patio surrounding my new pool. They are installed properly over a 6" concrete slab. We finally just converted the newly constructed pool to salt water this week and Im starting to heavily worry about the salt damage on the patio. Its only been 2 days so far and I see all these outlines of salt marks where the drippings and puddles from people getting in and out have made. I never even thought about this salt factor on the insanely expensive bluestone deck, which cost nearly as much as the pool did.

I have read for several hours online and of course there are many schools of thought. Some say don't seal, some say do seal, and some say just spray down after each use. I am also worried because I installed pex tubes underneath to take the heat from the hot bluestone and put the hot water into the pool.

I just wish I could find the best answer for protecting the bluestone and for the grout lines, which are showing ugly discoloration already. I almost tempted to go back to chlorine and ditch the salt water generator if I can't find a solution that works and I comfortable with.

I tried posting pics but is says file too large??

Thank you!
 
My bluestone coping is fine in its 3rd season no issues at all. I am not sure how you use that stone for the deck our coping gets so hot you can't touch it. You certainly could seal it but the you would probably need to reseal every 2-3 seasons.
 
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G,

Just to be clear... You have had the blue-stone decking for at least one season before switching to saltwater and never had an issue with people getting in and out of the pool??

Is this true?

Thanks,

Jim R.
 
The pool was finished in September last fall. We only swam a few times last year before we closed it. Then this spring we opened it, balanced the old water, them converted to salt water last week. Only got to swim in the salt water a couple times but it was enough to see how bad the salt is leaving some very concerning looking stains. I have not used the solar tubes underneath the bluestone yet so I don't know how well they work. But my mission is to make sure I properly preserve and protect the bluestone. Any insight would be very helpful.

IMG_20190527_093300.jpgIMG_20181030_113739.jpgIMG_20180906_115449.jpg
 
G,

My point is... is the salt the problem or is it just the pool water drying? Even if you get rid of the saltwater, it won't be long before the pool will have 1000 ppm of salt anyway..

What makes you believe that the salt is the issue.. Keep in mind that the salt in the ocean is about 35,000 ppm and that your tears are about 3500 or about the same as the salt level in your pool.

Thanks,

Jim R.
 
It is the salt water that is leaving the stains. Last season there was no staining at all. The salt reading before we switched was 600 ppm. It looks really bad, but more worrisome is the potential deterioration. After swimming today there are dried salt outlines from where puddles dried up.
 
G,

Weird... I am not sure what the Blue Stone has to do with it?? I have three saltwater pools and none of them have rings of dried salt on the decking.. Granted none of them have Blue Stone, but if it were the salt, you would think everyone would have the same issue, no matter what the decking was made from. :scratch:

Jim R.
 
Can you post a full set of testing from your TF-100? Perhaps your CH is high or something else. I run my salt around 3500 and get no stains on my bluestone coping at all where the water dries up.

Also tell us more about your under-deck heating system. Sounds ingenious if they found a way to harness the heat from the bluestone into your pool. You say you have never turned it on? I would want to run water through it to keep it from getting stagnant.
 
I have concrete techo bloc coping (black onyx). Not the same material i know, but you can see the dried salt on my coping too. No one but me would notice. I have no deterioration issues after a full season of the swcg (and 3 prior years with chlorine). It stands out because of the dark coping but I wouldn't worry about it from a deterioration point.
 

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Sorry I know this is an old post, but I’m having the same problem with my new bluestone patio and salt water pool. What helps is if you hose off the patio every night. In the morning it will look fine. Here are two photos, one with the stains and a part that I already hosed down and it dried.
 

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