I dont believe doser's can back siphon just given their design (liquid is pinched out in one direction) It's not a free flowing tube so its not like the return line in your tank.
Some dosers will back-siphon because they use fewer rollers. Dosers should have 4 rollers to prevent back-siphon. Some only have 3. Drew's Dosers and Profilux both use 4 rollers.
12-11-2010, 12:22 AM
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