Response to muriatic acid and exposed aggregate concrete

Hi folks! If you do not want to use the acid you can use other products that are safer. You will need to find a supplier to the trade to get the product range of choices to pick from. Look in the phone book under brick or concrete block suppliers and start there. Tell themm you want a masonry washing product called "600 Detergent " I believe it is made by a company called Thoro, but other competitor companies have competing products. This is not as harsh as the acid. A side note on the acid: it should never be used straight from the bottle as it will burn your new masonry surface a ugly brown color which you wont be able to remove. You need to dilute it in water and use elbow grease and a brush. I cannot figure why they are advising you to use acid on your new slabs. On both your new and old slimey slabs just rent a commercial ( at least a 13 hp ) pressure washer and clean them both squeakey clean then go back to the supply house and get a water based silane/ siloxane masonry water repellant and apply it liberally. Cover your plants and dont spray to heavily at the edges.This will seal your concrete and make it easier to get the slime off in the future. Kirk... I think the white stuff you refer to as lime was probably efloressence ( look it up ) a leaching of salts in the masonry mortar mix which usually indicates water IN the wall which you may have resolved with the thompsons stuff. Remember that products like thompsons are only coatings, the commercially available silane/siloxanes are true pennetrating sealers that do a much better and long lasting job.

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