Dosing pump for Top-Off?

Have anyone use dosing pump for their top-off water?

I would like some input from those who have tried or currently implementing it to their system.

What are some of the PRO and Con?

Thx
 
I'm currently looking into the Tom Aquatic Aqua-Lifter Dosing Pump (with suction pre-filter). Looks inexpensive and reliable based on reviews on MD. Autotopoff.com also sells their own dosing pumps as well.
 
Thanks guys, anyone else using their dosing pump to top-off their fresh water?

I already have a GHL Profilux and want to use one of its extra pump as a top off.

Thx
 
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