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John Fullerton

  • Posts: 2
Efflorescence and red Algae removal from render
« on: June 24, 2022, 12:50:17 pm »
Hi, Got this render clean to do and just a tad unsure on the best way to tackle the efflorescent on this render.

Any thoughts would be appreciated.



  • Posts: 12054
Re: Efflorescence and red Algae removal from render
« Reply #1 on: June 24, 2022, 02:21:01 pm »
are you sure its effervescence ?

are you soft washing it?

personally I'd need a close up photo - but I would say from that a good hypo solution is required to get off all the organic stuff and see what it looks like after

if your sure then a quality brick cleaning cleaner/acid will be required - then treated with a control chemical to prevent re-occurance

however I think your looking at water staining  degrading the surface - but as I say need a better picture

A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.

John Fullerton

  • Posts: 2
Re: Efflorescence and red Algae removal from render
« Reply #2 on: June 29, 2022, 07:42:23 pm »
Thanks for your reply Darran,

I tend to agree with you on the water staining, I've done quite a few sand & cement render cleans with some similar type staining but in much smaller areas.

A good 4% agitated hypo wash should do the trick