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This little diaphragm pump is an excellent choice for automatic top-off duty. Unlike other diaphragm pumps available, this little powerhouse can push water to 60psi (~130ft high). It can also safely run dry, unlike conventional powerheads. It is quiet and runs on 12v DC power. Flow rate is approximately 400mL/min, but note that it is not rated for continuous duty nor salt water applications. This means for intermittent use (as in ATO usage) it is great, but we do not recommend it for use as a calcium reactor feed pump, for example.  It can be used in conjunction with a kalk stirrer, but only to push fresh water into the stirrer.  We do not recommend pulling kalkwasser through the pump, as the high pH may shorten the life of the rubber diaphragms.

Diaphragm pump kit includes:
Pump in wall-mountable box
12v DC Power Supply
Tubing, 10ft
Check valve to prevent back siphoning
Micro ball valve to adjust flow rate (max 400mL/min)
Siphon break tee (see instruction manual for details when this is needed)
 
Technical Specs:
Max flow rate:  400mL/min @ 0ft head pressure
Min flow rate: Fast drip
Max head pressure: 60psi or 130ft
Run dry: Yes
Self priming: Yes
Power: 12v DC, 4w max, 2w min
Warranty: 1 year

Click HERE for instruction manual