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APEC RO-PH90

Ranked #16 of 50 in Best Reverse Osmosis Systems (2026). Here is every spec we scored, where it came from, and how it compares.

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A

#16

APEC RO-PH90

Best for: 6-stage 90 GPD alkaline under-sink RO with a named WQA contaminant list

2.1/10

What we like

Watch out for

Drain water per product gallon not published by APEC
Warranty not published by APEC

Score breakdown

Daily production 24%

NSF/ANSI 58 named 20%

Broader named certification 16%

Drain water per product gallon * 16%

Filtration stages 12%

Warranty * 12%

* Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

Daily production	90 GPD
NSF/ANSI 58 named	No
Broader named certification	Yes
Drain water per product gallon	Not listed
Filtration stages	6
Warranty	Not listed
Daily production (maker)	90 gallons per day @ 60 psi, 75 gallons/day @ 50 psi and 77 deg F
Filtration stages (maker)	6 stages
NSF/ANSI 58 (maker)	WQA Gold Seal Certified (NSF/ANSI 58 is not named on the page we used)
Broader named certification	Official page names an additional NSF/ANSI standard (for example 42 or 53) or certified reductions beyond TDS
Drain ratio (maker)	Not listed
Drain water per product gallon	Not listed
Warranty (maker)	Not listed
Tank capacity (maker)	4 gallons. 14 gallons optional
Alkaline stage (maker)	6th-stage mineral filter
Certified reductions (maker)	Official page says the system is certified to reduce Arsenic+3, Arsenic+5, Barium, Cadmium, Chromium-3, Chromium-6, Copper, Fluoride, Lead, Radioactivity, Selenium, and Turbidity
Price	Check price

Check price at Amazon

Specs source:

APEC: RO-PH90

APEC RO-PH90 head-to-head

Head-to-headAPEC RO-PH90 vs APEC RO-90

How it compares

Open the full comparison table

Waterdrop X16

#1 · 11-stage 1,600 GPD tankless RO, NSF/ANSI 42 and 58 named, 3:1 pure-to-drain

Waterdrop X12

#2 · 11-stage 1,200 GPD tankless RO, NSF/ANSI 42 and 58 named, 3:1 pure-to-drain

Waterdrop X12-PRO

#3 · 11-stage 1,200 GPD dual-flow tankless RO, NSF/ANSI 42 and 58 named

Waterdrop X14

#4 · 11-stage 1,400 GPD alkaline tankless RO, NSF/ANSI 42 and 58 named

Waterdrop X8

#5 · 9-stage 800 GPD tankless RO, NSF/ANSI 42 and 58 named, 2:1 pure-to-drain

Waterdrop X8-PRO

#6 · 9-stage 800 GPD dual-flow tankless RO, NSF/ANSI 42 and 58 named

Waterdrop G3P600

#7 · 8-stage 600 GPD tankless RO, NSF/ANSI 42 and 58 named, 2:1 pure-to-drain

Waterdrop G3P800

#8 · 9-stage 800 GPD tankless RO with UV, NSF/ANSI 58 named, 3:1 pure-to-drain

iSpring RCC7AK

#9 · NSF/ANSI 58 certified 6-stage 75 GPD alkaline under-sink RO

APEC ROTL-A1000ALK

#10 · 5-stage 1000 GPD alkaline tankless RO, NSF/ANSI 58 and 372 named in the official title

APEC ROTL-A1000

#11 · 4-stage 1000 GPD tankless RO, NSF/ANSI 58 and 372 named in the official title

iSpring RO500-BN

#12 · NSF/ANSI 58 certified 500 GPD tankless RO with a 2:1 pure-to-drain ratio

iSpring RCC7AK-UV

#13 · NSF/ANSI 58 certified 7-stage 75 GPD alkaline and UV under-sink RO

iSpring RCC7U

#14 · NSF/ANSI 58 certified 6-stage 75 GPD UV under-sink RO

iSpring RCC7

#15 · NSF/ANSI 58 certified 5-stage 75 GPD under-sink RO

#17 · 5-stage 90 GPD under-sink RO with a named WQA contaminant list

Waterdrop T4-A

#18 · 450 GPD alkaline dual-flow under-sink RO with a 2:1 pure-to-drain ratio

iSpring RO1200

#19 · 1,200 GPD dual-flow tankless RO with a 3:1 pure-to-drain ratio

Waterdrop G5P700A

#20 · 8-stage 700 GPD alkaline tankless RO

Waterdrop G5P700

#21 · 7-stage 700 GPD tankless RO with a 2:1 pure-to-drain ratio

Waterdrop T3-M

#22 · 9-stage 450 GPD remineralizing under-sink RO with a 2:1 pure-to-drain ratio

Waterdrop D6

#23 · 6-stage 600 GPD tankless RO with a 1.5:1 pure-to-drain ratio

Waterdrop G5P500

#24 · 7-stage 500 GPD tankless RO

iSpring RO800G

#25 · 800 GPD tankless RO with an up-to 2.5:1 pure-to-drain ratio

iSpring RO600-BN

#26 · 600 GPD tankless RO with a 2.5:1 pure-to-drain ratio

APEC ROTL-600

#27 · 3-stage 600 GPD tankless under-sink RO

APEC ROTL-AIO

#28 · 600 GPD all-in-one tankless under-sink RO

iSpring RCC2AK-UV

#29 · 7-stage 200 GPD alkaline and UV under-sink RO

iSpring RO5004F-AK

#30 · 500 GPD alkaline tankless RO with UV and a 2:1 pure-to-drain ratio

iSpring RCC1UP-AK

#31 · 7-stage 100 GPD alkaline under-sink RO with a booster pump and UV

iSpring RCC2AK

#32 · 6-stage 200 GPD alkaline under-sink RO

APEC ROES-PHUV75

#33 · 7-stage 75 GPD alkaline and UV under-sink RO

iSpring PH100

#34 · 6-stage 100 GPD alkaline under-sink RO

iSpring RCC2

#35 · 5-stage 200 GPD under-sink RO

APEC ROES-PH75

#36 · 6-stage 75 GPD alkaline under-sink RO

APEC ROES-UV75-SS

#37 · 6-stage 75 GPD UV under-sink RO with a stainless housing

iSpring RCC1UP

#38 · 6-stage 100 GPD under-sink RO with a booster pump and UV

iSpring RCD100

#39 · 5-stage 100 GPD countertop RO with UV and a 2.5:1 pure-to-drain ratio

iSpring RO100

#40 · 5-stage 100 GPD under-sink RO

#41 · 5-stage 90 GPD fast-flow under-sink RO

APEC RO-PERM

#42 · 5-stage 90 GPD under-sink RO with a permeate pump for low-pressure homes

APEC ROES-100

#43 · 5-stage 100 GPD under-sink RO

iSpring RCC100P

#44 · 5-stage 100 GPD under-sink RO with a booster pump

APEC ROES-50

#45 · 5-stage 50 GPD under-sink RO with a 4-gallon tank

iSpring RCC7P

#46 · 5-stage 75 GPD under-sink RO with a booster pump

APEC RO-CTOP-C

#47 · Portable 4-stage 90 GPD countertop RO with a carry case

APEC RO-CTOP-PH

#48 · Portable 4-stage 90 GPD alkaline countertop RO

APEC RO-QUICK90

#49 · Compact 4-stage 90 GPD under-sink RO

iSpring RO10001F

#50 · Tankless under-sink RO with a 3:1 pure-to-drain ratio and 0.69 GPM listed flow