Is cal spa filters profitable to sell on Amazon United States?

The niche generates $19K/yr across 17 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +5.9%. Flapen's verdict: Skip it (47/100).

How competitive is the cal spa filters niche?

14 brands and 16 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 76% of demand.

What do buyers complain about in cal spa filters?

Top complaints mined from reviews: Filtration, Quality-Overall, Size-Overall. The return rate is 1.3%.

When does demand for cal spa filters peak?

Demand peaks in Sep–Oct; the busiest month runs 2.1× the quietest.

What does it cost to enter the cal spa filters niche?

Listings span $20.15–$45.38; the average listing price is $34.02 (sweet spot $15–$100). The average incumbent carries 227 reviews — the moat a new listing must climb.

cal spa filters

Skip it

A small market ($19K/yr) — this niche doesn't clear our bar today.

Avg price

Incredible$34.02

avg listing price — sweet spot $15–$100

Price range

Incredible$20.15–$45.38

cheapest to priciest tracked listing — scored on the share inside $15–$100

Review moat

Great226.94

avg incumbent reviews — the moat a new listing must climb

Returns

Great1.3%

return rate — above 5% kills the launch gate

Conversion

Good5.3%

search→purchase rate — share of searches ending in a sale

Brand share

Okay76%

top-5 brand share — brands hold most of the demand

Competition

Okay65%

top-5 click share — leaders hold, buyers still browse

Growth

Okay+5.9%

90-day search growth — must beat 0% to launch

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Market size

Bad$19K

$19K/yr · 11K searches

According to Flapen's Amazon United States niche tracking, cal spa filters is a $19K/yr Amazon United States market (11K searches/yr). The top 5 brands hold 76% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 47/100.

Data updated Jul 24, 2026 · scored weekly · How we score niches

cal spa filters market data

Units sold / yr: 750–1K; avg 0–100/product
Revenue / yr: $26K–$34K; units × avg price
Conversion rate: 5.3%
Avg BSR: #598
Page quality: 0%
Prime: 94%
Sponsored: 94%
Out of stock: 8.4%
Avg brand age: 37 months
Avg seller age: 205 days

Competition & brand share

The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.

Brands

14 falling

Sellers

Top-5 brand share

76%

Top 20: 100%

Top-5 click share

65%

Top 20: 100%

Open market

20%

Cryspool35%
Malaka19%
POOLPURE11%
LBLVBNEWD6%
JIPINE5%
HANXER4%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +5.9% search growth over the last 90 days.

Peak months: Sep, Oct · busiest ÷ quietest = 2.1×

Open Trend

Top cal spa filters search terms

cal spa filter replacement6K/yr +8.3%6.9% conv.
cal spa filters3K/yr +30.9%2.8% conv.
pww50l spa filter2K/yr -35.1%16.8% conv.

All search terms

Top cal spa filters products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 17 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Cryspool 04077 Compatible with Cal Spa Filters 4CH-949 PWW50L FC-0172 Rising Dragon Dynasty Spas 50 Sq. Ft Hot Tub Replacement Filter Cartridge 2 Pack

Cryspool$39.244.6★108 rev

Malaka Spa Replacement Filter FD2007 Compatible with PWW50L 4CH-949 FC-0172 Hot Tub Replacement Filter Cartridge 2-Pack

Malaka$45.154.6★707 rev

Cryspool 04075 Filter Compatible with C-4950 PRB50-IN FC-2390 Guardian 413-212-02 J200 Series Filter 03FIL1600 373045 Cal Spa Hot Tub Filter 50 Sq. Ft Spa Filter Cartridge 2 Pack

Cryspool$40.504.7★695 rev

POOLPURE 4CH-949 Spa Filter Replaces Pleatco PWW50L 200702 fil50-5d13h15fct-3 Filbur FC-0172 SD-01143 817-4050 FD2007 Waterway Teleweir 50 Rising Dragon 50 1pack

POOLPURE$26.364.7★1,012 rev

4CH-949 Spa Filter Compatible with PWW50L 200702 Cal Spa FIL50-5D13H15FCT-3 Filbur FC-0172 SD-01143 817-4050 Waterway Teleweir 50 Rising Dragon 50 hot tubs filter cartridge 2PACK 4.98x14.59

LBLVBNEWD$30.174.8★6 rev

Newest

by launch date

4CH-949 Spa Filter Compatible with PWW50L 200702 Cal Spa FIL50-5D13H15FCT-3 Filbur FC-0172 SD-01143 817-4050 Waterway Teleweir 50 Rising Dragon 50 hot tubs filter cartridge 2PACK 4.98x14.59

LBLVBNEWD$30.176 rev

6mo ago

KGC 4CH-949 Spa Filter 2 Pack - Compatible with Pleatco PWW50L Filbur FC-0172 SD-01143 817-4050 Waterway Teleweir 50 Rising Dragon 50. Hot Tubs Filter Cartridge

KGC$27.4951 rev

11mo ago

RARAYC 4CH-949 Spa Filter Cartridges - Compatible with Pleatco PWW50L & Filbur FC-0172 50 sqft Hot Tub Filter Replacement Fits Cal Spa FIL50-5D13H15FCT-3 Waterway Teleweir 50 2-Pack

RARAYC$28.733 rev

12mo ago

HANXER PPM50SC-F2M Spa Filter Cartridge Replaces for 5CH-502 Filbur FC-0195 Marquis Spa 20041 20091 Cal Spa 370-0237 C-5303 50501 2 Male Thread/MPT Hot Tub Filter 50 sq.ft Spa Filter 2 Pack

HANXER$29.4327 rev

1y ago

Beckacher 4CH-949 Spa Filter Compatible with Unicel Pleatco PWW50L Filbur FC-0172 SD-01143 817-4050 Baleen AK-90091 Rising Dragon 50 Waterway Teleweir 50 sqft hot tubs Filter Cartridge 2 Pack

Beckacher$32.05145 rev

1y ago

What buyers say about cal spa filters

What buyers praise and complain about, mined from review topics.

What buyers love

Size-Overall28%

“Fit perfectly”

Filtration21%

“The water cleared up nicely after install”

Value For Money13%

“Good value”

Advertised Vs Actual Product12%

“work as intended”

Quality-Overall11%

“Excellent quality and fast delivery”

Ease Of Cleaning3%

“We'll see how well it cleans up”

Design-Overall2%

“Build quailty looks equally good”

Durability2%

“They are durable”

Strength1%

“theyre solid and functional”

Material Quality1%

“The material seems very durable”

What buyers complain about

Filtration37%

“not as good as guardian filters”

Quality-Overall11%

“This is a cheap, irresponsible, wasteful, deceitful product”

Size-Overall11%

“Didn't fit”

Water Resistance6%

“Do NOT use in a salt water spa”

Thickness6%

“This filter seems to have thicker material than what we usually purchase”

Product Condition6%

“Was sent a USED filter in worse condition than the one I was trying to replace”

Durability6%

“windings are coming apart already”

Assembly/Installation4%

“it still was not ready to install”

Value For Money4%

“$15/filter and just toss the used filter in the garbage”

Top return reasons

Size-Overall69%

Filtration18%

Advertised Vs Actual Product7%

Connectivity-Overall1%

Compatibility-Overall1%

Value For Money1%

Add-Ons/Attachments1%

Functionality-Overall0%

Defective Material/Parts0%

Measurement/Reading Accuracy0%

Common questions

Is cal spa filters profitable to sell on Amazon United States?: The niche generates $19K/yr across 17 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +5.9%. Flapen's verdict: Skip it (47/100).
How competitive is the cal spa filters niche?: 14 brands and 16 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 76% of demand.
What do buyers complain about in cal spa filters?: Top complaints mined from reviews: Filtration, Quality-Overall, Size-Overall. The return rate is 1.3%.
When does demand for cal spa filters peak?: Demand peaks in Sep–Oct; the busiest month runs 2.1× the quietest.
What does it cost to enter the cal spa filters niche?: Listings span $20.15–$45.38; the average listing price is $34.02 (sweet spot $15–$100). The average incumbent carries 227 reviews — the moat a new listing must climb.