I bought these to replace my existing reverse osmosis pump. Positive are: very easy installation, good customer service, the pump includes a throttle, an automatic shut-off and a check valve. The only downside is that customer service says they "can't regulate the on and off pressure, so it turns on with only a 10psi pressure drop." cause TDS creep. In other words, your TDS increases every time it is turned on. I overcame this by putting a T in the input line of the POST filter and setting a 1/4" cutoff just before the POST filter and another cutoff at the fork of the T so I could turn the pump on manually - and off could Deliver and dump the first quart or so of water produced into a small bucket and pour it down the drain. (Every pump has this problem, but my last pump wouldn't turn on until after a 20psi pressure drop). I've since installed a 20 gallon tank so I don't have to monitor my system as closely.
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