Leslie Stain Remover (Ascorbic acid)

What is floc, clarifier, stabilizer, cyanuric acid,
algaecide, brightener, dichlor, sodium hypo,
sodium bisulfate, ....??
Denniswiseman
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Re: Leslie Stain Remover (Ascorbic acid)

Postby Denniswiseman » Thu 10 Dec, 2015 08:54

Will acsorbic acid work on concrete paviors


waterbob

Re: Leslie Stain Remover (Ascorbic acid)

Postby waterbob » Fri 11 Dec, 2015 11:43

You're probably best off using vinegar or muriatic acid as ascorbic acid can get real costly.

Is there a particular reason you want to try ascorbic?

If you have rust stains try oxalic acid instead.

Bob
Denniswiseman
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Re: Leslie Stain Remover (Ascorbic acid)

Postby Denniswiseman » Sun 13 Dec, 2015 07:56

Hi Bob

Thanks for that
I Just have some rust and didn't think I could eliminate it
I have vinegar and muriatic acid and I can get oxalic acid, what is best and what dilution should I use
Also will it remove the colour from the pavior
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Larry
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Re: Leslie Stain Remover (Ascorbic acid)

Postby Larry » Mon 14 Dec, 2015 03:08

Hi Dennis

Good to have you back at the forum.

In my experience with rust I have found the muriatic acid to be too aggressive and it etches the surface too quickly to be an effective rust remover. It is a very effective scale remover though.

I have never tried vinegar (weak acetic acid).

I generally use and recommend oxalic acid because it seems to do the least "collateral damage" for the amount of rust it removes. Being an acid, it will lighten the color of old concrete but doesn't eat it away like muriatic acid does.

The way we use oxalic acid is:
  • for localised dark spots (from wire, nails, welding flux, ...) we mix enough water to the oxalic acid to make a thin paste and apply the paste liberally. When the paste starts to dry (usually at least 45 minutes) we scrub the stain with a hard plastic brush or abrasive pad and a little water. Rinse and repeat.
  • for large light rust stains we mix 5%-10% oxalic acid by weight to warm water and spray liberally on the stained area. We keep the surface wet for at least an hour, reapplying as it begins to dry. We scrub the surface intermittently and the final scrub with fresh water usually removes most of the stain. We spot-treat any remaining stubborn spots.

As with any chemical treatment, test a small spot to see what effect the acid has on the surface before applying to the whole area.

Larry
Denniswiseman
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Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Leslie Stain Remover (Ascorbic acid)

Postby Denniswiseman » Mon 14 Dec, 2015 04:50

Thanks Larry

It's good to see the forum back to it's old self

I will purchase some Oxalic acid and do as you suggest
I was beginning to think the rust stains were going to be there for ever

Dennis
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Larry
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Tiled deck

Re: Leslie Stain Remover (Ascorbic acid)

Postby Larry » Mon 14 Dec, 2015 05:39

No problem Dennis

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