This is a high quality filter. I use a 1 micron poly filter in the first step to remove rust and particles, then a 1 micron activated carbon filter for flavor. Finally, replace the first stage poly filter about 3 times for 1 time for charcoal. I've been using Hydronix since December 18th. The price has gone up since then, but as has most things in this economy. it's still a great price
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