Originally Posted by sailorchic34
also called muriatic acid. Found in the paint departments of the average hardware store. Also good for cleaning calcium off the hull, Used diluted.
Muriatic is hydrochloric acid. A strong acid. Also likes to eat metal. It's used by pro radiator shops because it works fast, and time is money
I did my entire raw water cooling
system with phosphoric acid, which I got at my local stone place. All chemical cleaners with any sort of hazmat must have an MSDS which tells you exactly what's in them. Just take in a smart phone
the name and "MSDS" and you'll get everything you need to pick a product.
There are several advantages of phosphoric over hydrochloric. It's safer for the soft and disparate metals found in most heat exchangers. It won't eat the tubes, or brazing, regardless of how long it's in contact. It loves to eat carbonates. It won't eat rubber like hydrochloric. It's much safer if you spill it on the boat. It's safer if you spill it on yourself. They put food
grade phosphoric acid in soda. Depending on where you are you can safely (and sometimes legally even) run it down the sink drain back on land (DISCLAIMER: check first!).
I built my own back flush system and did all the work in place in the engine room. The biggest PIA was getting the buckets of used acid out of the boat and into the back of the truck. The whole thing was cheap
, just a small bilge pump
, some tubing, and five gallon buckets with lids.
Muriatic works, but it's unforgiving. Give phosphoric a look.