Decision Lantern

Home and office calculator

Reverse-osmosis planner

Reviewed Skip to the planner

Households choosing an under-sink RO system. The decision this page isolates is narrow on purpose: translate people into an ro class. Fit and capacity are the expensive mistakes. Settle those before you commit to a finish or a brand.

This page produces an explainable category or size so options can be compared without a product ranking. The calculator does not rank APEC and Aquasana. It produces an explainable class so APEC ROES-50, APEC RO-90, and Aquasana OptimH2O can be compared as examples of that class.

The working method is: Convert the inputs into a published planning class using the method on this page, then compare official product pages that match that class. Planning notes are grounded in ENERGY STAR. This page does not quote a price or rank a brand.

How to use this calculator

Households choosing an under-sink RO system. Translate people into an RO class. If you can answer people, this page can produce a class you can shop against.

What this page will not do

  1. Enter the planning inputs

    Choose an RO class by recording people. Use real measurements or counts, not a rounded marketing number.

  2. Keep optional extras off until they are real

    This tool has no optional add-ons. If a number is uncertain, calculate a range and keep the more conservative class.

  3. Read the planning class

    Calculate class and treat the headline as a class, not a product name. Matching examples below follow 5-stage, Starter, 90gpd, Growth, Remin, and Advanced.

  4. Compare official pages, then verify

    Open the official page for each example in that class. Confirm current specifications, dimensions, and terms. Decision Lantern does not quote a live price or complete an install review.

Planning classes on this page

5-stage
Example: APEC ROES-50
Starter
Example: APEC ROES-50
90gpd
Example: APEC RO-90
Growth
Example: APEC RO-90
Remin
Example: Aquasana OptimH2O
Advanced
Example: Aquasana OptimH2O

Choose an RO class

Planning class

90gpd

Compare options with at least:

  • Compare official product pages in this class
  • Specifications can change and must be verified

Example products for Reverse-osmosis planner

Real products that fit this planning category. Specs come from the manufacturer’s product page. These are examples, not rankings. The links are official product pages—not affiliate links yet.

Compare the official examples

The table below is a side-by-side of the official examples on this page. Columns are published facts—maker, planning class, and notes taken from the official page—not scores. APEC ROES-50, APEC RO-90, and Aquasana OptimH2O are included so you can see how classes differ, then open the official page for the current specification.

Published facts for the example products on this page. Not a ranking.
ExampleMakerPlanning classesPublished notesOfficial page
APEC ROES-50APEC5-stage, Starter5-stage; 50 GPDAPEC ROES-50 official page
APEC RO-90APEC90gpd, Growth90 GPD; Higher flowAPEC RO-90 official page
Aquasana OptimH2OAquasanaRemin, AdvancedRO + remineralize; ClaryumAquasana OptimH2O official page

Which example fits which class

APEC ROES-50

APEC

APEC ROES-50 from APEC is an example in the 5-stage and Starter class. Published notes on the official page include 5-stage and 50 GPD. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.

APEC RO-90

APEC

APEC RO-90 from APEC is an example in the 90gpd and Growth class. Published notes on the official page include 90 GPD and Higher flow. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.

Aquasana OptimH2O

Aquasana

Aquasana OptimH2O from Aquasana is an example in the Remin and Advanced class. Published notes on the official page include RO + remineralize and Claryum. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.

What to verify before you buy

How this estimate works

Convert the inputs into a published planning class using the method on this page, then compare official product pages that match that class.

Know the limits

  • This page does not quote a price or rank a brand.
  • Manufacturer specifications and program terms can change and must be verified on official pages.
  • The result is a planning category, not a safety, medical, legal, or install guarantee.

Frequently asked questions

How does the reverse-osmosis planner work?

It converts people into a planning class using a published rule. Convert the inputs into a published planning class using the method on this page, then compare official product pages that match that class. The headline is a class such as 5-stage, Starter, 90gpd, Growth, Remin, and Advanced, not a vendor ranking.

Is APEC ROES-50 better than APEC RO-90?

This page does not rank APEC ROES-50, APEC RO-90, and Aquasana OptimH2O. APEC ROES-50 and APEC RO-90 are listed because they are real products with official pages that map to different or overlapping classes. The useful question is which class matches your inputs.

Can I treat the result as a buying recommendation?

This page does not quote a price or rank a brand. Use the class to decide what to read next, then verify fit, terms, and installation requirements on the official page and with a qualified installer when the product needs one.

Do the product links earn Decision Lantern a commission?

Not on the current preview. Links go to official manufacturer or service pages. If compensated links are added later, the disclosure on this page will say so in plain language.

What should I verify after I get a class?

Confirm the current specification, dimensions or plan limits, and any program terms on the official page. Manufacturer specifications and program terms can change and must be verified on official pages. The next editorial review for this page is due 2026-11-14.

Why these 3 examples?

They are real home and office options with an affiliate program on file and an official product page. APEC and Aquasana appear because each one can represent at least one planning class on this page, not because Decision Lantern tested or endorsed them.

Sources

  1. ENERGY STAR water heaters, ENERGY STAR. Retrieved .

Next review