Kent's systems use cheaper parts which I don't like and Vertex doesn't offer enough flexibility in my mind. BWI is probably fine but they only have 100gph membranes available... 75gpd has a higher rejection rate and has been what was recommended to me in the past. So I like the units sold on Bulk Reef Supply. They use john guest fittings, Filmtec membranes and you can opt to build your own system consisting of only the parts that you want.
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