When it comes down to it - many of the "core units are similar, if not the same." (so it seems)
What really matter is the TDS rejection rate and the type/brand of filters being used.
I would not recommend a horizontal DI setup - DI sits on top of the main unit laying down.
There are a few economical choices out there and are really great units! I just purchased the Ocean Wave+ from filterguyz and absolutely love it! Literally took me 10 minutes to start making RO/DI from the time I took it out of the box. Melev has a nice system he sells as well.
Good luck!
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Thank you. Drive Thru!
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