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They all look to be private labeled Chinese crap, to me
For something that can kill your tank, and looks like they will fail...
I’m looking at the Apex DOS. Don’t like the price though. 800 for controller, and 600 for 4 dosers.
Best bet is GHL IMO, $460 for a SA 4 head that doesn't need a controller atall
+1 for Kamoer F4 pro, but you can't go wrong with ghl either.
Get a 4 head GHL doser and buy a float switch and you can use one pump for your ATO.
I do have spectrapure for awc and ato. Lots or love for GHL. Thanks guys I will probably go that route 4 channels.