I used to use the AP Tapwater Filter on my 46 gallon and still keep it around as a backup now that I've gone to a bigger tank and RO/DI. It's great for a smaller tank, but really too slow for anything larger than 50 gallons or so.
It's essentially just a DI cartridge which is a good choice for the GVRD given that our TDS is very low. You'd be going through the cartridges (which are not cheap) like crazy if you were in Calgary, for example. In fact, last time I checked OA uses DI only for its water.
You also have to be careful with the little plastic water diverter that you put on your tap. It's easy to leave it diverted and you end up with a jet of water spraying sideways if you turn on the tap anymore than a trickle. Worse yet, you could mess up the DI resin if you've left it attached and you turn on the water full blast.
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