Magnetic Pumps

[typrobin]

hi all...i did a search in the forum but can't find anything....

anyone care to explain wats the diff between a cheap atman pump and a so called magnetic pump like Resun MD40?? i don't intend to buy any tunze or add any pumps into my tank(temperature problem), so need a strong pump to create the waves....issit a good idea to only use the return pump to create waves???

are ehiem pumps good enuf? my neighbour has spare and willing to sell to me at $60 but i dunno the model....he said it got it at $100++

mine is a 3ft X 1.5 X 2ft(height) tank...intend to modify the return flow to the center of the tank and point it slightly downwards...

[Eric]

hi all...i did a search in the forum but can't find anything....

anyone care to explain wats the diff between a cheap atman pump and a so called magnetic pump like Resun MD40?? i don't intend to buy any tunze or add any pumps into my tank(temperature problem), so need a strong pump to create the waves....issit a good idea to only use the return pump to create waves???

are ehiem pumps good enuf? my neighbour has spare and willing to sell to me at $60 but i dunno the model....he said it got it at $100++

mine is a 3ft X 1.5 X 2ft(height) tank...intend to modify the return flow to the center of the tank and point it slightly downwards...

Got a suggestion for you.........instead of using powerheads or tunze, why not use another high rated return pump and link all 4 corners with the thinest pvc piping you can find and make each corner PVC piping with 3 outlet, top, middle, low.........that way you can have good circulation everywhere & higher cycle rate.

[weileong]

If you try that top, middle and bottom. Once power failure you'll see that your floor is flooded

Unless you install check valve but that is prone to choking.

[kschew1498]

If you try that top, middle and bottom. Once power failure you'll see that your floor is flooded

Unless you install check valve but that is prone to choking.

Exactly....please be careful....the check valve is not 100%......it only slow down the backflow......I have installed one and I can still see a very very small stream of water flowing back to the sump when simlating a power cut off.

[weisoon]

Exactly....please be careful....the check valve is not 100%......it only slow down the backflow......I have installed one and I can still see a very very small stream of water flowing back to the sump when simlating a power cut off.

kschew,

can you show a pic of the check valve you are using. Just want to know the brand. Thanks.

[narkosis]

The back-siphon problem during a power failure is easily taken care of, by drilling a hole in the PVC pipe just under the surface. Once the water drops to the hole, air is sucked in, and the siphon breaks.

[odi]

How high a flow rate is good enuff? I have a similar tank and have problems with circulation. Sandbed quite dirty.