In my Quantum PD31, the filter was also under the bed. I removed it completely and traveled for two years with no filter at all. This year I got tired of carrying 50lbs of bottled water all the time so I installed a Culligan drinking water faucet on the kitchen counter. I installed the RC-EZ-4 filter unit under the counter where I can easily access it by removing two drawers. This is a sealed cartridge so changing it poses minimal spillage risk.
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