black mold cleaning agents on split face travertine

[tstex]

Hello to All,

First, Happy Father's Day to all you TFP Dads !

On the spa that spills over to pool, it is split face travertine [off white] and the lower portion towards the pool water, the stone has black mode grown btw stones and w/in holes. No pool water comes in contact w this area on either side but both places are about 3-4" above pool water line.

Does anyone have a recommendation on what is best to kill mold w out damaging stone and if product goes into water, there's no minor issues? Whatever amt of product drips into water/pool, I am sure the dilution rate is so great that there's going to be no real issue.

Again, Happy Father's Day and thanks,
tstex

 

[Chuckiechan]

There are other ways, but this is worth a try (test in somewhere for bleaching first):
Make a slurry of 20 mule team borax, and coat the area. Try to keep it damp. Renew it every few days.
The borax should kill it off. It’s used in my house to prevent stinky towels.

 

[tstex]

Thanks Chuck - borax is alkaline so that will work...I'll give it a try

 

[Arizonarob]

Allen has some stuff he swears by for mold and mildew removal. (I’m not sure if it’s safe around the pool, but I’ll ping him and get his thoughts.)
@ajw22

 

[ajw22]

Allen has some stuff he swears by for mold and mildew removal. (I’m not sure if it’s safe around the pool, but I’ll ping him and get his thoughts.)
@ajw22

Wet & Forget | No Rinse Outdoor Cleaners, Product Selector

WET & FORGET OUTDOOR PRODUCTS| A Solution For Every Outdoor Cleaning Task- Hose End. Concentrate. Ready-To-Use. We'll guide you to the right product.

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Follow directions and spray on surface. Don’t scrub or rinse. Best applied on a sunny day when it is not going to rain for a day or more. It is environmental safe and does not harm plants or animals. What it does do is change the pH of the surface and kills mold and mildew.