APEC Water SystemsROES-100 Essence 5-Stage 100 GPD Reverse Osmosis System
Double the output of the ROES-50 for nine dollars more, and no certification at all.
$240
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Usability
Usability
The ROES-100 is the strangest value proposition in the APEC range: it doubles the production rate of the ROES-50 for nine dollars more and gives up the WQA listing to do it. Its strongest attribute is refill speed, which matters in a household that empties the tank daily and is invisible in one that does not. Its weakest is that certification, because the ROES-50 sitting next to it at a lower price is the one with the listing, and APEC does not explain the difference anywhere. Owners who have asked APEC directly report being told the ROES-100 and the Ultimate RO-Hi share housings and drain line dimensions, which suggests the higher output comes from the membrane alone. The buyer is trading the only third-party evidence APEC offers for throughput, and that only pays off in a high-consumption home.
- 100 GPD, double the ROES-50, for nine dollars more
- Shares housings and drain line dimensions with the Ultimate RO-Hi
- Fast tank refill suits households that empty four gallons a day
- Standard cartridges keep the annual replacement cost low
- Assembled in California with lifetime technical support
- No WQA listing and no certification, unlike the cheaper ROES-50
- APEC does not explain why the higher-output model lost the certification
- Higher production rate means proportionally more drain water
- Warranty is one year unless registered within eight weeks
- Reviewers cover it far less than the ROES-50, so independent evidence is thin
The APEC Water Systems ROES-100 is the highest-output tank system in the Essence line, a five-stage under-sink reverse osmosis unit rated at 100 gallons per day. It shares its housings, drain line and tank with the Ultimate RO-Hi according to answers APEC has given owners directly. Unlike the ROES-50 and ROES-PH75, this model carries no WQA listing and APEC's own product imagery marks it as uncertified.
Additional information
Specification: APEC Water Systems ROES-100 Essence 5-Stage 100 GPD Reverse Osmosis System
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Questions answered from our data

How much does a reverse osmosis system cost?The 69 reverse osmosis systems we list run from $165 to $3,779, with a median of $367.
How long do reverse osmosis filters last?Of the 69 reverse osmosis systems we list, 64 state a filter life; the most common is 6-12 months (62).
Does reverse osmosis remove fluoride?63 of the 76 reverse osmosis systems we list claim to reduce fluoride.
Do water filters remove lead?120 of the 296 systems we list claim to reduce lead.




