SLF Water Filtration Comparison · 2026
APEC RO-PH90
Recommended for shoppers who prefer proven traditional RO hardware but want higher 90 GPD output and alkaline remineralization.
Express Water RO5DX
Recommended for value shoppers who want a conventional RO platform with verified TDS certification and simple long-term servicing.
APEC RO-PH90
Choose RO-PH90 for 90 GPD plus alkaline remineralization and WQA Gold Seal certification; choose ROES-50 for lower cost or a Waterdrop/iSpring tankless model for much faster production.
RO Performance & Ownership
Compare RO output, filtration stages, remineralization, contaminant evidence, certifications and ownership cost.
Which Is Right for You?
APEC RO-PH90
Best for: Homeowners wanting broad reverse-osmosis contaminant reduction plus minerals added back for taste and pH, without moving to an electronic tankless system.
Consider if: Want Remineralization, Want TDS Display
Express Water RO5DX
Best for: Budget-focused homeowners wanting traditional RO, standard-style replacement filters and automatic leak protection.
Consider if: Budget Under $200, Want Remineralization
Our Recommendation
APEC RO-PH90
A strong premium traditional RO choice for households that want alkaline remineralized water and established certification without electronics or a tankless design.
Express Water RO5DX
A strong budget traditional RO system, provided shoppers understand that its NSF/ANSI 58 listing specifically certifies TDS reduction rather than every contaminant named in marketing.
The Short Answer
Choose RO-PH90 for 90 GPD plus alkaline remineralization and WQA Gold Seal certification; choose ROES-50 for lower cost or a Waterdrop/iSpring tankless model for much faster production.
Choose RO5DX for low-cost traditional RO and leak protection; compare APEC ROES-50 for another certified traditional system or a Waterdrop/iSpring tankless model for faster, more water-efficient production.
Water Filter Comparison FAQs
Answers are generated from the current SLF product records for these two systems.
Which is better, APEC RO-PH90 or Express Water RO5DX?
APEC RO-PH90 is the overall pick for this specific matchup. Choose RO-PH90 for 90 GPD plus alkaline remineralization and WQA Gold Seal certification; choose ROES-50 for lower cost or a Waterdrop/iSpring tankless model for much faster production.
Which system has the higher daily filtration capacity?
APEC RO-PH90 has the higher rated output: 90 GPD versus 50 GPD.
Which system offers remineralization?
APEC RO-PH90: Yes. Express Water RO5DX: No.
Which system has the lower MSRP?
Express Water RO5DX has the lower MSRP in the current SLF records at $209.99, compared with $409.99 for the other system.
Do both systems require a plumbing connection?
APEC RO-PH90: Yes. Express Water RO5DX: Yes.
Which system is more renter friendly?
APEC RO-PH90: No. Express Water RO5DX: No. Check lease and plumbing-modification rules before installing an under-sink system.
What certifications are listed for these systems?
APEC RO-PH90: APEC RO-PH90 is WQA Gold Seal certified to NSF/ANSI 58. The certified reduction scope includes lead, fluoride and other specified contaminants. Broader APEC claims covering 1,000+ contaminants should be treated separately as manufacturer claims unless included in the applicable certification or performance data. Express Water RO5DX: NSF's official current listing identifies Express Water RO5DX under NSF/ANSI 58 with a 12.22 GPD certified production rate and TDS Reduction claim. The listing also confirms weighted-average lead content <=0.25% for lead-free plumbing requirements. This does not mean NSF certifies every contaminant-reduction claim in Express Water marketing.
How do estimated annual filter costs compare?
APEC RO-PH90: $74.99. Express Water RO5DX: $69.98. Actual replacement timing and prices can vary.