Got some dosing pumps for Christmas!

[BriDroid]

I picked up some Sentia dosing pumps for myself for Christmas. I'm looking forward to automating my AFR and ammonium bicarbonate.

Question, do I need to dose the AFR under the water line? I'm concerned that it may crystalize if above the water. If I do dose under the water, do I need to install a check valve, or will the nature of the pump stop anything from siphoning? If I do need a check valve, is anyone aware of one that is small enough to fit that 2mm ID tubing?

 

[fishface NJ]

My dose line is above the water. Dosing container is lower then the dosing output

 

[fishface NJ]

Doser is the highest
Dosing output is lower
Dosing container is lower than output line (you can see the container on the bottom right…All 4 Reef container)

 

[Pod_01]

or will the nature of the pump stop anything from siphoning?

How many rollers are in the dosing head? If 3 there should be no siphoning, if 2 rollers there is minimum chance of siphoning.
The pumps I use all have 3 rollers:

When I used AFR I had the end of the line submerged and no check valve. I didn’t want to introduce additional failure point.

Good luck,

 

[BriDroid]

How many rollers are in the dosing head? If 3 there should be no siphoning, if 2 rollers there is minimum chance of siphoning.
The pumps I use all have 3 rollers:

When I used AFR I had the end of the line submerged and no check valve. I didn’t want to introduce additional failure point.

Good luck,

It has 3 like the one you posted. Thanks!

 

[SliceGolfer]

If possible, place your ato output line so that it “rinses” your AFR line. No crystals ;)