09-26-2012 08:07 PM
I want to clean my flagstone patio of any film and small stains from grouting it recently. My worry is that the muriatic acid might somehow damage my plastic drain/corrugated piping. I've tried elbow grease and a stiff brush, it helped a little but leaves something to be desired. I just don't want to take any chances since I will be very dependant upon this drain working for years to come. Is there a risk of damaging the drain?
09-26-2012 08:13 PM
Muriatic acid is very strong and can do a lot of damage if not used properly.
It will "eat" concrete.
Try very diluted solution first. Than add small amounts, easyily, and see how it works for you.
I can't answer the " pipe" question for I have never seen it used in such matter.
Here, peoiple use it to clean up the driveways.
09-26-2012 08:16 PM
09-26-2012 08:18 PM
use white disstilled vinegar straight...
09-27-2012 12:10 PM - edited 09-27-2012 12:12 PM
put a hose with running water at the drain opening, scrub with a diluted acid. the running water will further dilute the acid and keep it moving. also adds a barrier between the drain and acid. use enough water to completely flush the drain. do not use soap or detergent during the scrubbing.
09-27-2012 12:34 PM
Thanks, I'm going to try sticks suggestion of using white vinegar. Hopefully it works. I'll let ya'll know.
09-27-2012 02:15 PM
If you do use the acid, here's a method to neutralize for safe disposal:
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10-04-2012 07:42 PM
After confirming that the corrugated pipe and plastic used to make the drainage box was hdpe, I cleaned the stone using a 10:1 dilution and a stiff scrub brush on a long handle. It worked well. I'll probably need to clean it one more time along some short retaining walls that I plan to brick soon.