I have to replace this FX12P filter only after 4 months of use (I bought a new GXRM10G filter set from Home Depot). Suddenly one day the GXRM10G stopped working - no water out of the faucet.
I disassembled it. The post-filter looked OK (still white), but the pre-filter one became black. Worse, the pre-filter then stopped to filter the water well, so as result it damaged the RO membrane, making me to replace all of them.
My water quality is fine - for years we have drunk from the faucet. We use the filter just after having children
That contradicts to what they claim that the pre-filter can last 6 months and the RO membrance can last 3 years.
After relacing first time, 2 days ago, after a month, the filter stopped giving water again. I opened the pre-filter and see that it became black again. I had to buy to replace it again.
Don't buy this. If this hapens again next month, I will trash the whole GXRM10G.
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