#2: Replace a pair of 1100 GPH pumps with a pair of 4500 GPH mp40's and wonder why the flow seems worse than the two 'much smaller' pumps. When you turn it on you will be shocked at the amount of detritus that the mp40 allowed to settle. Replace it with a 6105 in the same spot, position it with the same flow trajectory. The reality is that water moving below a certain rate doesn't carry enough force to lift detritus or do the other jobs well that flow is expected to do in a reef. What you can't describe in GPH is the amount of work** that flow of water is capable of doing. That's what GPH means, of course - gallons (*volume) per hour (time). Of measuring volume of flow in a give time. GPH is totally an accurate way of measuring. (They actually have a few different models in that price range.) I like either of those options, as well as the non-controllable Tunze 6020. Roger: Cue the video on 'flow vs turbulence' for them to further explain as well as illustrate the issue: Force is measured in distance units per time.such as centimeters or feet per second. Force is the useful aspect that actually does the things we want flow to do like move detritus and to enable our corals to breathe. Try replacing an mp40 with a 6105 some time on a mature tank - it's crazy how much detritus the mp40 is incapable of lifting into the water. However, an mp40 is just about useless outside of the 24' of space is can flow.very weak flow to maybe 36'.īy comparison, a 6105 can be used in any tank up to six feet long and will generate good flow across the whole tank. The mp40 is $380 for supposedly 4,500 GPH.Įither is about $0.08 per GPH so you might be tempted to think they are comparable. Look at an MP40 vs a Tunze 6105 for an easy comparison. Most propeller pumps on this thread end up consuming a lot of their own flow, so the effect on the tank is diminished from what the GPH number would lead you to believe. The only other thing I can add is a reminder about how GPH doesn't mean a lot for a propeller 's used on regular pumps that are designed to move water through pipes. How can I disagree with a statement like that! 🤣 Granted, I understand $250 maybe a lot for a wave maker Best WaveMaker on the market for the price.

Wavemaker placement in reef tank