Hi, Is a full face respirator necessary when using hydrchloric acid in a water solution to clean walls(Externally), we will also be jet washing the wall after the application. I also have concerns regarding the run off water which will be entering the drains. I have ordered the required clothing such as acid resistant gauntlets, acid resistant rain suit, acid resistant wellington boots but i am not sure about the respirator. I was initially looking at a full face visor and goggles with a half mask but the visor may not sit correctly with the goggles and mask. Is respiratory equipment necessary as the solution container will only be open Momentarily then water will be added to dilute.

If you’re only concerned about the respirator element during the part where you’re diluting the acid it’s probably best to buy the acid ready diluted – otherwise there’s lots of risks with handling acid solutions, taking tops off containers, getting the correct concentration levels. Are you adding water to the acid - or water to the acid, I’m sure one’s dangerous but I can’t remember which way round it is! As I say it's easier to buy it in the concentration you want in the first instance.

That's neat, LB. I was taught it in a much more boring fashion. The heat of mixiing is high and the mixture is likely to boil and spit. Which do you prefer hits you in the face, water with a little acid in it, or acid with a little water in it? It's a no-brainer really!

LeeRob Are you just trying to get a bit of muck off ie traditional brick cleaning after a messy 2 in 1 gang or are you doing something more sinister? If just brick cleaning then again if only one or two bits or a whole side of a terraced street will affect the control necessary. I think you will get more help from people if you can explain what you are doing - Personally if I could ban grit blasting toys like the quill falcons I would ...extremely noisy - plugs and muffs required and very hard physical work - some contractors I know who used them even had to pay the boys more money to do the work.....!

I would have thought that the respirator would only be needed if there was poor ventilation. If your working outside there may be enough ventilation to avoid the need for respirators. Although a full face visor is a must.