How should I estimate AquaTru replacement-filter costs?

Copy the current prices and both gallon- and time-based replacement limits from the seller and current manual. Include every required filter, then count whole replacement purchases at whichever limit is reached first.

Is a countertop water purifier cheaper than bottled water?

It depends entirely on how much water you drink and what you pay per bottle. A household drinking very little water may never recover the purchase price. The honest answer requires running your own numbers rather than accepting a marketing comparison that omits replacement filters.

What costs do filter comparisons usually leave out?

Replacement filters are the main omission, and they recur for as long as you own the unit. Electricity and wastewater are also excluded from most comparisons — individually small, but not zero for a reverse-osmosis system.

Research note

Estimate what a water filter costs to own

The sticker price is the smaller number, and the one every comparison leads with.

The cost that repeats

A purifier is bought once. Its filters are bought for as long as you own it, and a certification only holds while the filter is inside its rated life. A filter used past its replacement interval is not a certified filter — it is a housing full of spent media.

The current price is whatever the seller quotes today, not a number this article can safely preserve. Copy the unit price and every required replacement-filter price from the seller, then copy the gallon and month limits from the current manual into the calculator below.

Why the calculator starts blank

Prices, packages, and service intervals can change. Blank inputs prevent an old quote from looking current. The estimate also includes a separate VOC carbon-filter row and optional electricity, wastewater, and maintenance fields so omitted costs stay visible.

Editable ownership estimate

Copy the current purchase price, replacement-filter prices, and service intervals from the seller and current manual. The estimate buys whole replacement filters at the earlier of the entered month or gallon limit. The filters included with a new unit are counted in the unit price, not purchased again on day one.

Current purifier priceWater used per day (gallons)Drinking and cooking only

Required replacement filters

Use zero or leave blank only when the current manual says that filter or limit does not apply.

Pre/carbon filter pricePre/carbon life (gallons)Pre/carbon life (months)RO filter priceRO life (gallons)RO life (months)VOC carbon filter priceVOC carbon life (gallons)VOC carbon life (months)

Other annual ownership costs

Electricity per yearWastewater per yearOther maintenance per year

Replacement filters purchased over 5 years

0 · $0.00

First-year estimate

$0.00

Cost per gallon over 5 years

—

Against bottled water, over five years

Cost per bottleBottle size (gallons)16.9 oz ≈ 0.132 gal

Purifier, 5-year total

$0.00

Bottled water, 5-year total

$0.00

On these numbers the purifier costs $0.00 more over five years. If that is your situation, it is a reason not to buy one.

Reading your own result honestly

If the five-year total comes out higher than what you currently spend, that is a real answer and a reason not to buy. A household drinking a glass or two a day may never recover the purchase price, and no amount of framing changes that.

If it comes out lower, the saving is real but slower than the sticker comparison suggests — because the filters keep arriving.

Either way, cost is the second question. The first is whether you have a contaminant worth filtering at all, and that is answered by a test, not a calculator.

Start with your free report Filtration decision guide

Sources

AquaTru pre/carbon filter product page — current replacement details; copy the live price into the calculator.
AquaTru reverse-osmosis filter product page — current replacement details; copy the live price into the calculator.

Last reviewed 25 July 2026. Prices and filter life change; confirm both with the manufacturer before buying. Educational information only.

The lighter-home letter

One problem, one free step, and one honest buying decision each week.