They work pretty good with the micron cartridge.
Even the 350 can be a "move around, hob, polisher".
Just understand the flow rates of these filters.
HOT 250 is 250gph, max, with a clean cartridge.
Mag 350 is 350gph, again, with a clean cartridge.
The smaller the tank, the sooner you would see any improvement.
If your tanks have a bunch of free floating debris, they will clog up pretty fast.
The cartridge is 8 micron rated and that is really a small hole.
For the money, if buying new, you could make a unit out of a external capable pump, some pipe/tubing, and a "whole house" water filter and save a couple bucks.
You won`t save a bunch, but you will get a better amount of flow, depending on the pump you use.
These filter cartridges clean in the 20 micron range for the rust/sediment and 10 micron for the taste/odor.
The cartridges are almost twice the size of the Mag, so they should last twice as long between cleanings.
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Thats a pretty good idea.....thanks I'll be using that one.