At some point, the cost of a ZS, and multiple S/G filters puts you close to the price of an entry level RDF. The Draco Solum 16 will flow the same as a small ZS and retails for $2025. The ZS is $1300 plus the cost to build, and plumb 3 separate S/G filters (+/- $400). You would also get the same flow with a smaller pump since you don’t have the added head of the S/G filters, thus saving money monthly. Add in the fact you won’t have to do weekly cleanings and it really becomes a very small price difference.
As far as a pit, you could fit a solum 16 and your pump in a 3’x3’ block pit.
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