I have wanted to auto dose for a while, but I have about a 5' lift from the floor to the top of the tank. I tried little Rio pumps and even big giant fountain pumps at HD but they couldn't lift 5'. I even tried to reduce the hose size down to about 1/16" for IV hose, thinking it could push-but I guess that old saying of running up against a "fundamental" came true.
This left peristaltic pumps. Long story short, I bought 2 Drew's Doser Pumps for $89 each at Bulk Reef supply. They look suspiciously a lot like other pumps, but they seemed cheaper, so I bought. Here are the contents of the box, pump, hose, measuring cup, instructions:
It pumped the 5' with no problem, but I was curious about how far it would pump, having seen others post the same question. So I decided to do the following test:
I bought 20' of cheap hose:
Here is the suction side (I cut suction hose from another hose--the 20' remained intact):
Here is the assembled test set up:
I filled the hose by siphon to get all the air out and then connected it to the pump.
I set the timer on my smart phone for 15 minutes and plugged it in. I chose 15 minutes thinking that the second test might take a while to build up pressure before it started pumping (it didn't) to give it time to get going.
Ground level control test begins--note that the pump is going through all 20' of hose (not shown), but the input and output are roughly the same (in hindsight, I should have held the cup to the top of the jug so it wouldn't get a siphon effect-not a big deal):