Does he ever stand to urinate a full stream? If all he is doing is a constant dribble, he may have Urinary Calculi... this can be deadly as the stones will build up until the urethra is totally blocked causing the bladder to rupture.
A vet can do an x ray to see if he does have stones...it can be fixed if caught early enough.
Ammonium chloride is the best treatment followed by Coni Ross' onion recipe. If niether of those are an option then look up the fruit pectin, like for canning stuff, remedy. Stacey on here has used it i believe
oh, ok i see we did have some lose mineral out there at one time but i have not thought about it this summer for some reason. Dose the minerals normally have the AC in there our do you have to add it your self?