How do I remove Calcium deposits on Brick Coping/Mortar? I have small thin white lines developing on my mortar between brick coping. Also have a white film on brick coping by tanning ledge. Pool is 15k gals I/G white plaster finish, with SWG. Pool water chemicals are okay from local pool supply store as of yesterday. I have tried pumice stone with pool supply recommended cleaner to no avail.

Any suggestions are appreciated.