02-18-2004, 04:22 AM
Join Date: Jan 2004
Location: Corpus Christi, Texas US
| | Eheim Diffuser
The think the Eheim diffuser works very well. I saw it for $15.99 at Drs. Foster & Smith. I bet all diffusers use the same glass sintered disk. My pH is normally about 7.8 and I get it down to 6.7 in my 75 gallon tank at a kH of 6. In the 125 gallon tank it is not quite enough, but two Eheims would be perfect. I have built several reactors and they where all inferior to the little Eheim. The last reactor I built is three feet long and 3 inch diameter. I am using it on the 125 gallon right now and it is slightly better tha one Eheim diffuser, but a three foot reactor is pretty hard to hide. I would much rather go with two Eheim diffusers.
The Eheim diffuser comes with a high pressure check valve. I think it must be pressured to about 15 psi for it even to open up. It has a metal spring in it, and overall I had a lot of trouble with the diffuser until I threw the check valve in the garbage. I replaced it with a cheap Tetra check valve from Petsmart, and I put a $12 Clippard needle valve in the line for regulation. I think this is the secret to using the Eheim diffuser.
In fact for you reactor affectionados, I will buy your used Eheim diffuser if you think your reactor is better.