I would use 100 % food grade vinegar.
It is already a diluted acid and given enough time, will dissolve all the
calcium away.

To get rid of biological deposits that vinegar will not get, I use 1:1
solution of household bleach.
Soak the equipment in it long enough to dissolve the bad stuff, then rinse
MANY times and soak with a dechlorinator like amquel+. My CPR overflow and
BakPak had become clogged with little sponge like critters to the point both
devices were choking and had do this to dissolve them away.

CW
"bacala" wrote in message
news:YUGAe.74603$oK.20755@okepread02...

"Billy" wrote in message
...

"FordStyle" wrote in message
. com...
Soak it in a mix of white vinegar and water and it will help remove the
calcium deposits. If you can stick it in a container that's large enough
and run the pumps over night it this mix it will help clean some of the
internals a little better. This will help remove the calcium deposits
but not sure of all the tube remnants from the small dusters....

Second that. Various brushes can be of use, I purchaced a couple toilet
brushes (marked and stored away from the bathroom for obvious reasons)
that are handy as hell.

billy

What ratio of water to vinegar do you recommend? 1 to 1?

Also what do you think about using a mild strength hydrochloric acid or
other type of acid?