Add Calcium to your DI water
 

this is a good idea for those that want to bolster calcium and trace elements in their aquarium with no effort....

http://reefbuilders.com/2010/02/23/r...ge/#more-15672

Very cool idea. I think I'll give this a try as it is very cheap and no extra effort. I like that combination!:biggrin:

That's interesting. I wouldn't have guessed though that pH of 7.0 was enough to significantly dissolve enough aragonite to be meaningful. It would be interesting to test Ca and Alk, pre- and post- canister to see the difference. Too bad I chucked out the last bit of reactor media I had, I would have loved to try it - although I don't have a spare filter canister I could have used anyhow. Soooo ... anyone else want to give it a try and post the Ca and Alk numbers?

x2 !

looks like I got a use for that old canister, now just need some sand

I will try to do this today or tomorrow. I will take readings and post them as soon I can. hopefully other may try this and we can compare results.:biggrin:

I run a storage (bladder) tank off my ro/di, wondering best if the sand cartridge before or after the tank (or doesn't matter).

I would put it after just to prevent any sand particles from carrying over into your storage tank, but it really doesn't matter.

Would you be able to run this in place of a calcium reactor? Maybe threw your ATO.

I'm curious to see if this makes a difference. I've got a few spare cartridges kicking around somewhere, maybe even a clear one. I think I'll try setting one up right before my ATO goes into my tank. Flow should be nice and slow there. Too bad all my old sand is now in the garden :sad: