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Remove calcium(?) stain from stone fountain?

Test a spot with white vinegar as a solvent.  Scrub with a brush. 
This is used with success for hard water stains on teaware. 
 
Paint :rofl:
 
There's this stuff called LRC that can remove most buildups but it's pretty nasty.
 
I've read Coca Cola is strong enough to dissolve egg shells but it takes time...
 
 
Edit: I meant CLR like others have posted.
 
ahaha. acid bro. been there dont that about a billion times. pool tiles need the treatment basically every year.
go to the pool store and get some HCL... about 8-10 bucks a gallon if you buy a box. get some goggles and gloves maby.
 
buy a flip top bottle ... like what you use in a suntan lotion bottle. your pool place may or may not sell them(or give them away in my case).
 
like this.
 
http://www.usplastic.com/catalog/item.aspx?sku=60149&gclid=Cj0KEQjwiKS3BRCU-7XQ75Te3NoBEiQAA2t_xB7-wydwlUXzwrFOUxQj36v9TuOTZiePvryKVQKN_nEaAoML8P8HAQ
 
get a nylon brush, no metals... nothing reactive.
 
then sorta dripple it down onto the calcium buildup.
 
it will react and release co2 heat and steam and water. dont breath any of that in.
 
cheapest by FAR. but there are also acid gells that work better as they cling onto the surfaces. they cost alot more though and usually are pissy weak.
 
queequeg152 said:
ahaha. acid bro. been there dont that about a billion times. pool tiles need the treatment basically every year.
go to the pool store and get some HCL... about 8-10 bucks a gallon if you buy a box. get some goggles and gloves maby.
 
buy a flip top bottle ... like what you use in a suntan lotion bottle. your pool place may or may not sell them(or give them away in my case).
 
like this.
 
http://www.usplastic.com/catalog/item.aspx?sku=60149&gclid=Cj0KEQjwiKS3BRCU-7XQ75Te3NoBEiQAA2t_xB7-wydwlUXzwrFOUxQj36v9TuOTZiePvryKVQKN_nEaAoML8P8HAQ
 
get a nylon brush, no metals... nothing reactive.
 
then sorta dripple it down onto the calcium buildup.
 
it will react and release co2 heat and steam and water. dont breath any of that in.
 
cheapest by FAR. but there are also acid gells that work better as they cling onto the surfaces. they cost alot more though and usually are pissy weak.
Diluted?
 
yea you can dilute it to what ever you want, but i usually dilute 50% for acid washing with a spray bottle.
 
with the dripper bottle i dont usually dilute it at all. not because it works better, but because im just to lazy. i use the stuff for ph down so i just keep a the dropper bottle full for that use... to clean the tile i just grab the thing and go at it. its not that dangerous unless your get it in your eyeballs.
 
This stuff can be found almost any where and does work wonders on calcium build up.
clr.jpg

 
 
Boiling whole lemon halves in a kettle always removes the calcium build up inside. Maybe you could pour this hot water onto your fountain to see if it will help.

Other than that, I'm sure CLR would work.


SR.
 
Sizzle Lips said:
This stuff can be found almost any where and does work wonders on calcium build up.
attachicon.gif
clr.jpg
 
 
that stuff DOES work and it does work well, especially if its gelled.
 
i have not used CLR personally... but i have tried several of the gel products you can get at hardware and pool stores.
 
thing is though all of these products are just acids. a bottle of HCl will clean ungodly amounts of tile or grout and what ever else. much more than that CLR bottle. especially if you dilute it way down and add some thickening agent or gelling agent.
 
its certainly possible its not calcium.
 
do you have any nitric acid(hydro ph down)  or sulfuric acid(drain cleaner)? scrape some white junk off and dribble a tiny amount of acid onto it.
 
if it bubbles its probably carbonate.

or phosphoric acid? another hydroponic ph down
 
queequeg152 said:
its certainly possible its not calcium.
 
do you have any nitric acid(hydro ph down)  or sulfuric acid(drain cleaner)? scrape some white junk off and dribble a tiny amount of acid onto it.
 
if it bubbles its probably carbonate.
or phosphoric acid? another hydroponic ph down
I wonder if it might be a by-product of the antifoaming agent I add. I'll check the ingredients.
 
interesting. i wonder what it is then.  how concentrated was the acid?
if it was carbonate you should have seen somthing like this very briefly, provided you scraped off enough of it.
if it was residue surfactant, it would come off with some polar solvent like water.  i guess it could be soap scum. that should react with acid though.
 
you might just get one of those scrubby brushes that attack to your drill and maby something like a pummice gritted cleaner or what ever. 
 
queequeg152 said:
interesting. i wonder what it is then.  how concentrated was the acid?
if it was carbonate you should have seen somthing like this very briefly, provided you scraped off enough of it.
 
https://www.youtube.com/watch?v=Lw3bWR0Ws7M
 
if it was residue surfactant, it would come off with some polar solvent like water.  i guess it could be soap scum. that should react with acid though.
 
you might just get one of those scrubby brushes that attack to your drill and maby something like a pummice gritted cleaner or what ever.
Undiluted sulphuric acid. Dribbled it straight from the bottle.

Soap scum?? From what? So, you think the hcl acid would be a waste of $$?
 
Roguejim said:
Undiluted sulphuric acid. Dribbled it straight from the bottle.

Soap scum?? From what? So, you think the hcl acid would be a waste of $$?
 
soap scum from your surfactant?  just a guess. you probably dont add enough to see any real soap scum though.
 
if your concentrated sulfuric acid did not cause any fizzing, its not carbonate, and therefor HCl will be useless just like the sulfuric.
 
both acids do the exact same thing,  they basically force feed it electrons;.
rjacobs said:
muriatic acid.  It will eat it.  It eats concrete.
 
most strong acids will eat concrete.
 
sulfuric, nitric, flouric i think, certainly HCl(muriatic)
 
HCl is by far the cheapest, thats why i reccomended it earlier. however no reaction means its probably not carbonate scale.
 
queequeg152 said:
 
certainly HCl(muriatic)
 
HCl is by far the cheapest, thats why i reccomended it earlier. however no reaction means its probably not carbonate scale.
 
I didnt associate HCL with Muriatic.
 
 
My advice to the OP is destroy said fountain and buy a new one.  Less aggravation.
 
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