Thanks for the info Eli

Once moved I will order some bulk for my doser that still sits pretty in its carton.

OK... so going to set this up, tonight. Late tonight.

My instructions never indicated how to hook up the tubes or check valves.

Any advice?

I have my check valves just above my bottles.

Oh and tip: wet the tips of the check valves and connectors then slip them right into the hoses.

I didnt have very much hose left over after hoses were setup for 2 bottles.
Plan your hose lengths ahead of time. My total setup was about 30 mins.

So it's just to stop siphon to the tank or from the tank?

Yes, it hardly has enough hose. I definitely need more.

My hoses don't go below my water level. Meaning the fluid just drips into the sump so no siphon possible. So my check valves are to stop any back flow into my fluid containers.

I don't have a doser so I may be wrong. For a doser to be accurate the hoses must always be completely full otherwise the pump well count it's cycles and nothing is deposited until the tubes fill up again resulting in an under-dose. The check valves ensure the tubes are always full to the brim.

This.
If you have a vertical run into your tank, then after the dose, the lines may allow air to creep up the tube, depositing more solution than anticipated, and not as much solution the next time the pump runs.

The pumps themselves will prevent backflow from the tank into the product containers in the event of a submersed line.
That being said, I just stuck mine after my containers so that air doesn't creep in on the input side, since my outputs are a horizontal span with a 1" vertical drop into the tank. My setup really doesn't really need the check valves, but I figured I'd use them anyways.

Finished. Now to figure out dosing.

http://i653.photobucket.com/albums/u...b/2356b864.jpg

Looks nice and clean. Good work.