I was having issues with my stock return pumps-they did not always restart after feeding, so I decided to "upgrade" to the Eheim 600 compact pumps.
It was a quick mod, but I am not very satisfied with the end result, the flow is drastically reduced from the stock pumps. I had previously removed the stock skimmer and went to the 9002 and Intank media basket. This made a drastic increase in flow compared to stock(the bio beads and stock carbon were removed from the pump chamber)
I bought the pumps and some 12/16mm(1/2") Eheim tubing from Marine depot. I also purchsed some elbows, but they were not suitable (the hole size was slightly too large for the stock pump discharge pipes to fit.)
I ended up just running the tubing direct to the outlet nozzles, with a nice gentle bend to the tubing to make the turn.
The stock discharge pipes can be easily removed from the stock pumps with a gentle twisting motion and a pair of pliers. The are glued in with minimal glue. The Eheim tubing fits nicely on both the pump and the stock discharge pipes. I cut the tube length such that one pump is close to the bottom and the second is 1/2 way up the pump chamber.
Right now one of the pumps is touching the side of the pump chamber- causing a bit of noise, but this can be fixed.
The pumps seem to start and stop reliably, and the flow seems sufficient, but definately less than stock. If I was to do it again I would try bigger pumps.
here is a pic of the parts
It was a quick mod, but I am not very satisfied with the end result, the flow is drastically reduced from the stock pumps. I had previously removed the stock skimmer and went to the 9002 and Intank media basket. This made a drastic increase in flow compared to stock(the bio beads and stock carbon were removed from the pump chamber)
I bought the pumps and some 12/16mm(1/2") Eheim tubing from Marine depot. I also purchsed some elbows, but they were not suitable (the hole size was slightly too large for the stock pump discharge pipes to fit.)
I ended up just running the tubing direct to the outlet nozzles, with a nice gentle bend to the tubing to make the turn.
The stock discharge pipes can be easily removed from the stock pumps with a gentle twisting motion and a pair of pliers. The are glued in with minimal glue. The Eheim tubing fits nicely on both the pump and the stock discharge pipes. I cut the tube length such that one pump is close to the bottom and the second is 1/2 way up the pump chamber.
Right now one of the pumps is touching the side of the pump chamber- causing a bit of noise, but this can be fixed.
The pumps seem to start and stop reliably, and the flow seems sufficient, but definately less than stock. If I was to do it again I would try bigger pumps.
here is a pic of the parts
