My local club makes one using the plastic cartridge that goes in an RO
unit. I believe the cost is around $100 to put it together.
I'm not sure about adding those things to your reactor especially when
it will be cycling through your tank.

"John Cassara" wrote in message
t...
Is any one using a DIY Ca+ reactor on a small tank? I want to build one
for use on a 30 gal tank. All the plans I find are for units that are much
to tall for my cabinet. Would like some thing about 12" tall that can run
off a small external pump like a mag drive.

Has any one experimented with non-Co2 methods of ph control in the
reactor, such as dripping muriatic or acetic acid?

John