aqua medic reef doser

Tips & Tricks:
Avoid using petroleum based lubricants and keep the pump hose supple by using silicone based lubricants.
Use your SP-3000 to pull water through an apparatus rather than pushing it through.
Use a check valve on the inlet side to enhance the self-priming nature of these pumps in situations where the pump is above the liquid source.
Under heavy use conditions, the pump hose should be replaced about every three months.

I copied this from the Marine Depot site, check out the 3rd line. I think once you get your check valve installed you should be good to go. They don't list a replacement valve on the site, but maybe if you call them you can get one from them. If not I'm sure you can find one from another place.
 
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