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I have a storage tank (Brute Garbage Can) that I use to store my RODI water for water changes. It would be useful if I could just pump the water to my tank, rather than bucket lug. The storage tank is about 18ft away from the aquarium, from the floor to the top of my aquarium is about 5 ft.

I need a pump that is strong enough to pump the water that far, but not so strong that the water flow destroys my aquascape.

I would prefer it to be a submersible pump and I would just drag the hose out when its water change day.

When I'm looking at the flow charts for the pumps and it says for example: max head height 12ft, does that mean the pump can only push water through a hose that is 12ft long or does it mean it can only push water vertically 12 ft up?

If its vertically, than am I correct in that if I purchase a pump capable of a "head height" of 6ft, than I should be good? Seems I'm missing something here.
 

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Head is the vertical column of water that exerts pressure on the pump, same as if you put your thumb over the discharge. But tube friction also increases pressure so the pump has to compensate for long runs especially if small diameter tubing is used. That is why some pumps have only one hose size.

My advice is to get a DC variable speed pump, then you can adjust to suit. If you get a stronger single speed pump, you can make a simple bypass that diverts water back into the bucket via a ball or gate valve. You can add a discharge valve to fine tune

PonicsPump PP40006 is an inexpensive pump that would probably rate down to 200gph in your setup, and you can adjust the input screen and forgo the bypass valve if you move closer to the tank.

I have a Jacod DC variable pump that so far has performed flawlessly.
 
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