White residue on stone

[williamsfab5]

What is this and how should I clean it. In case it doesn't come through in the pics, it's a white residue that appears to be leaking from our rocks/stone onto the tile. It's on the side of the hot tub as well as stones under the waterfall. (No picture of waterfall) I've tried scrubbing with various things. It's like a glue or cement. It's very hard.

[/URL]

 

[pooldv]

It is either efflorescence pushing through the mortar or it is scale.

Muriatic acid will take it off.

Your water is very likely to scale and you need to manage your CSI. Enter all your results into PoolMath and it will give you a CSI score. Keep that number -0.3 to 0 to prevent scale. Adjust pH and TA to change the CSI. More here, Pool School - Calcium Scaling

 

[williamsfab5]

Thanks. How should I clean it with Muriatic acid? Dilute (what ratio) and apply with a brush?

 

[pooldv]

You can try diluting it 1 to 1 with water but stone guys usually use it straight. In a spray bottle is probably best and then brush it.

 

[Ale_Brewer]

Wear gloves! That stuff is dangerous. When I got my pool it had calcium spots like that. I mixed it 50/50 and put it in a pesticide spray can made for chemicals, the kind you pump up and it sprays a fine mist. Spray, let it foam, hit it with the water hose. Repeat. Many times. It'll disappear in a few minutes.


Sent from my iPhone using Tapatalk

 

[Frankhugus]

That stuff is annoying and recurring. I've used razor blade scraper on the tiles. Probably should try the spray acid/scrub for the rock. Balance!

 

[WorldChampSpurs]

Muratic acid

Sent from my LG-D415 using Tapatalk