Calcium deposits from Wateless Urinals

I'm not exactly sure if I'm posting this in the right spot or not.

I'm a custodian in a large industrial setting where we have waterless urinals. We have no problems in cleaning them, but we're finding that the pipes in the walls are being plugged with calcium. We've had problems with the urinals "overflowing" after the filter is being changed. My question is how do what chemical (not a abrasive chemical) can we use to help dissolve the calcium?

We change the filters on a weekly schedule because they get alot of use.

Thanks

Muriatic acid will clean out the calcium build up.

copper?

are the drains made of copper?

david

the pipes are pvc. I had to ask around because I know nothing about plumbing cause I'm just a jantor.

urinals

We clean flush type urinals, and toilets, with muriatic, (swimming pool), acid. Do not use sufuric acid because it is useless for this application.

This is an informative thread. I have not had any personal experience with the waterless urinals, but Smiley's experience seems to back up some of the criticism which is expressed in oppostion to these. At a minimum, it sounds like some scheduled preventive maintenance may be in order on these.