Any reason why you didn’t go more in depth on the St. Paul Mercantile filters? After doing a fair bit of research on gravity filters I chose the 3.5 gallon size instead of the Royal Berkey. Less expensive, can fit 6 filter candles instead of the Berkey’s 4, doesn’t require pressurized priming of the filters, and filters flouride and chloramine (plus a bunch of other things) without add-on doodads.