I need to flush/clean my HVAC units on my Tiara 43 Sovran — I have 5 units. I have a pump to create a circular flush system; I just need to know how much Muriatic Acid I should mix with water. Since the units hold cooling water in them, I would reduce the amount of water needed to mix with the Muriatic Acid; I just do not know how much water they each hold. I would like to hear from others that do this service themselves. I am located in Florida. Thanks!

Steve,

Thanks for the grandfatherly advice on the choice of acid.  I just finished flushing my coils today.  I normally would have reached for the muriatic acid, but before doing so, I stopped to read a few of your posts both here and there, and opted for the phosphoric acid instead.  Good thing.  As I was backing out of the engine room door, the end of the hose popped out of the bucket, a siphon was created and soaked me from the left hip down before I could set the bucket down and pick up the end of the hose.  Glad it was only a phosphoric acid solution and not the other.  See, no matter how careful you are, you just never know….

I flushed each unit for 2 hours while I did other things.  So, I don't need the speed of the bad stuff since no one pays me to do my work anyway.  I will always remember this and will never opt for the muriatic acid.  Thanks again.