Well if we are only talking $19.99 for the refillable cartridge, then no problem I am still in on this one.
One cartridge + 1 set of refills for me please!
Now that it has been explained, it totally makes sense and was what I was expecting. I just wanted to make sure after getting the "sticker shock" on the AquariumPros web-store. I can see the difference, and a refillable cartridge is all I need.
BTW, I picked up a 1 micron sediment filter from Canadian Tire today for $6.99 and a carbon cartridge for $9.99. Less than $20 after taxes, not bad for the two cartridges that get replaced the most (every 4-6 months for me).
And they have two-packs of the above cartridges for even greater savings, but I wanted to try these out first before buying a bunch. Anyways, I digress.