RO Membranes
 

I bought mine at a store called Alberta Fresh Springs Water Co. Ltd. Unit F3, 8330 McLeods Tr. S.E. Ph: 403-278-0003

It is a small strip mall on the corner of McLeod Trail and Heritage Drive. It as a London Drugs in it. It is half way up the hill on the south side if you are heading east on Heritage drive.

Mine is a 50 GPD membrane and it cost me $60. They had lots to choose from. I brought mine along to match it up.

Good Luck.

Your problem doesn't sound like it stems at all from TDS. Why don't you tell us more about what your seeing, or post some photos, and maybe we can help you fix it.

10 nitrates would that do harm to the corals?

Not likely. It might impact colour, and growth, but I doubt it would cause the symptoms mentioned.

How do you supplement for Ca, dKH, Mg, etc.?

I could overnight something if really needed.