Whole House Water Filter Systems: Add-On Prices and Filter Change Schedules

On Aquasana’s page, the extras can cost more than the system.

Aquasana’s Rhino whole house water filter system lists at $1,998 MSRP and was on sale for $999 when we read the Aquasana whole house filters page on 2026-10-23. Its three priced add-ons list at $1,548 + $1,598 + $248 = $3,394, more than the system. Aquasana rates the Rhino tank for “1,000,000 gallons or 10 years”. The running cost is the pre-filter: a 3-pack is $36.99 and each lasts up to 2 months, so $73.98 a year. Every number here is in our daily water filter cost table or on the maker’s own page, dated.

Aquasana’s three priced add-ons list for more than the Rhino they attach to

Each price is from Aquasana’s whole house listings, read 2026-10-23. The page shows each add-on’s list price next to a sale price for adding it to a system (“$1,548.00 +$774.00”), half the list price during the sale.

1. Salt-free scale prevention: $1,648 on the Rhino Max Flow and HealthShield listings, $1,548 on the base Rhino (sale add-on price $824 / $774). Aquasana says it works “without the use of harsh chemicals or salt.” Weak spot: it is the priciest add-on on the Max Flow, and its listed job is “scale prevention.” Fix: test first. EPA’s Protect Your Home’s Water page says “Scaly residues, soaps don’t lather” is the sign to test for hardness.
2. UV Filter: $1,598 ($799 with a system on sale). The Max Flow listing calls it “Recommended for well water” and says it “Sterilizes up to 99.8% of bacteria and viruses.” That is the maker’s own claim, and it names no standard. Weak spot: the base systems do nothing about microbes. In Aquasana’s words, a “UV Filter must be added to tackle bacteria and viruses.” On a well, count it as part of the system, not an extra.
3. Pro-Grade Bypass Kit: $248 ($124 on sale). It “Does not include PEX tubing.” The page gives no tubing price, so none of the totals here include it.
4. Low Maintenance Pre-Filter: free with a system during the sale. Aquasana says it “lasts 3X as long, meaning fewer replacements.” Weak spot: the page shows no list price for it today and no month or gallon rating, only the ratio, so the totals below leave it out.

The same page shows customer ratings going down as price goes up: Rhino 5/5, Rhino Max Flow 3.7/5, HealthShield 3.2/5. It shows no review counts, and it badges the Max Flow “Best Seller” and the HealthShield “New Product,” so give the averages little weight.

Rhino and Max Flow builds cost 0.10 to 0.63 cents a gallon

This table takes the list (MSRP) and sale prices from Aquasana’s page on 2026-10-23 and spreads each build over the “1,000,000 gallons or 10 years” rating. It assumes the whole build lasts as long as the main tank. The HealthShield listing gives no gallon rating, so it gets no per-gallon figure.

Build	List (MSRP)	Sale, 2026-10-23	Per gallon at list	Per gallon on sale
Rhino	$1,998	$999	0.20¢	0.10¢
Rhino + UV	$1,998 + $1,598 = $3,596	$999 + $799 = $1,798	0.36¢	0.18¢
Rhino + all three priced add-ons	$1,998 + $3,394 = $5,392	$999 + $1,697 = $2,696	0.54¢	0.27¢
Rhino Max Flow	$2,798	$1,399	0.28¢	0.14¢
Max Flow + all three priced add-ons	$2,798 + $3,494 = $6,292	$1,399 + $1,747 = $3,146	0.63¢	0.31¢
HealthShield	$5,796	$2,898	no gallon rating	no gallon rating

The two limits in the rating meet at 1,000,000 ÷ 10 = 100,000 gallons a year. A household that uses more than that reaches the gallon limit before year ten.

Then add the pre-filters. The 20-inch pre-filter 3-pack is $36.99, and Aquasana says each one “lasts for up to 2 months”. That is 6 pre-filters, or 2 packs, a year: 2 × $36.99 = $73.98, and $739.80 over ten years. At the sale price, ten years of pre-filters ($739.80) cost 74% as much as the Rhino itself ($999).

Three whole house systems in the table: Aquasana, iSpring and Crystal Quest

The filter cost table re-reads these prices from each maker’s own store every day. Rows below were last read 2026-10-23 (Aquasana) and 2026-10-22 (iSpring, Crystal Quest).

System	System price	Replacement	Rated life	Filter cost per gallon
Aquasana Rhino	$999 (MSRP $1,998)	pre-filter 3-pack $36.99	tank 1,000,000 gal or 10 years; pre-filter up to 2 months	$73.98 a year in pre-filters
iSpring WGB32B, 3-stage	$516.99	3-filter set $125.99	100,000 gallons	$125.99 ÷ 100,000 = 0.13¢
Crystal Quest Carbon Block, with stand	$278.99	not in the table yet	sediment 6 to 12 months; other cartridges 12 to 24 months	not computable

The iSpring is the only one of the three whose replacement set has both a price and a gallon rating, so it is the only one with a true filter cost per gallon. Crystal Quest’s own catalog text says to “replace the pleated sediment cartridge every 6 to 12 months”, while other Big Blue cartridges “typically last 12 to 24 months”.

Pentair’s pre-filter is due 1.3 to 2 times a year; Aquasana’s every 2 months

Pentair’s whole house filter page (read 2026-10-23) publishes a change schedule for its own system. The prefilter goes “Every 6-9 months.” The carbon media lasts 5 years or 650,885 gallons on the PC600-P, and 5 years or 1,301,770 gallons on the PC1000-P.

Stage	Rated life	Changes per year
Pentair prefilter	every 6-9 months	12 ÷ 9 = 1.3 to 12 ÷ 6 = 2
Pentair carbon media, PC600-P / PC1000-P	5 years or 650,885 / 1,301,770 gal	1 ÷ 5 = 0.2
Aquasana Rhino 20-inch pre-filter	up to 2 months	12 ÷ 2 = 6
Aquasana Rhino tank	10 years or 1,000,000 gal	1 ÷ 10 = 0.1

Weak spot: the Pentair page shows a “Discontinued” tag. Check that a model is still sold before you plan around its replacement media.

Both makers say 97% of chlorine; Pentair names the certifier

Aquasana says its maximum-flow system “reduces 97% of chlorine” (Aquasana), and the Rhino product page says it is “Independently tested to NSF/ANSI Standard 42 to remove up to 97% of chlorine.” Pentair’s page says “Certified to reduce 97% of chlorine” and names IAPMO R&T, an outside certification body, and NSF/ANSI 42, the standard for taste and odor issues such as chlorine (Pentair). The number is the same, but the claims are not. “Certified to” means an outside body checked the product against a standard. “Tested to” does not name who certified it.

Private wells get no public monitoring, so EPA leaves the testing to you

EPA says private wells generally “do not receive the same services that wells supplying the public do” (EPA well contaminants page). Its national primary rules “apply to public water systems” (EPA primary regulations). EPA’s Protect Your Home’s Water page gives well owners this routine:

1. Test every year for total coliform bacteria, nitrates, total dissolved solids and pH.
2. Test right away after you replace or repair any part of the well system.
3. Test for hardness if you see scaly residues or soap that won’t lather. That result tells you whether the $1,548-$1,648 scale add-on is worth buying.

If you are on a well, include the UV in your price: $1,598 at list, $799 with a system during the sale.

Secondary limits on a test report are only guidelines; fluoride gets a notice

EPA calls its secondary standards “non-enforceable guidelines.” They cover cosmetic or aesthetic effects such as taste, odor or color (EPA regulations and contaminants). The exception is fluoride: EPA requires a special notice when water goes above the fluoride secondary standard of 2.0 mg/L. That duty falls on community water systems, not on private wells.

Buy the base Rhino; pick the Max Flow for flow or the HealthShield for PFAS

The Rhino shares the flaw of all three base systems: it does nothing about microbes until you add the UV. But it is the cheapest of the three, with the same 1,000,000-gallon rating as the Max Flow, which lists for $800 more. So on city water with no scale, buy the Rhino alone: $999 on sale, 0.10 cents a gallon, plus $73.98 a year in pre-filters. On a well, add the UV.

Pick the Max Flow if your house needs more flow. Aquasana says it “reduces 97% of chlorine at 2X the flow rate”; the Rhino’s own page gives it “a rated flow rate of 7 gallons per minute (gpm).”

Pick the HealthShield if PFAS or chloramine is your concern. Aquasana says it can “reduce up to 99.9% of 61 contaminants including PFAS*, VOCs, pharmaceuticals, chlorine, and chloramines.” That is the maker’s own claim. The catch: it lists at $5,796, the most of the three, and has no gallon rating, so there is no cost per gallon to check.

If you need neither, buy the Rhino, or compare it with the iSpring WGB32B at $516.99 in the filter cost table. Other systems of this type are covered in the whole house water filter section.

FAQ

Is the sale price the real price? It is the price Aquasana’s page showed on 2026-10-23, next to the $1,998 MSRP. The filter cost table logs the day any price changes.

What does a Rhino cost to run each year? The pre-filters: 2 × $36.99 = $73.98 a year at list. The tank is rated for 10 years.

Do EPA’s drinking water limits apply to my private well? No. The primary rules apply to public water systems. On a private well, the yearly test is your job.

Get a well test or a hardness test before you price add-ons. The results decide whether $1,598 of UV and $1,548-$1,648 of scale prevention belong in your build.