---
title: "Cal Spa Filters — $19K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/cal-spa-filters"
last_updated: "2026-08-06T10:29:13.134Z"
locale: en
meta:
description: "Niche score 47/100 · $19K/yr market · 11K searches/yr · $34.02 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 47/100 · $19K/yr market · 11K searches/yr · $34.02 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Cal Spa Filters — $19K/yr Amazon US Niche (2026) - Flapen"
---
# **cal spa filters**
**Skip it**
A small market ($19K/yr) — this niche doesn't clear our bar today.
Market size 5Growth 32Conversion 61Competition 33Returns 88Price range 95Avg price 95Brand share 49Review moat 89Quality gap 24
**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**
**Great****226.94**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Great****1.3%**
return rate — above 5% kills the launch gate
**Conversion**
**Good****5.3%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Okay****76%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****65%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Okay****+5.9%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.6★**
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 ~~](https://flapen.com/research/methodology)
## **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**
**16**
**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.
400300Spike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep, Oct · busiest ÷ quietest = 2.1×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/cal-spa-filters/trend)
## **Top cal spa filters search terms**
- **cal spa filter replacement**6K/yr+8.3%6.9% conv. - **cal spa filters**3K/yr+30.9%2.8% conv. - **pww50l spa filter**2K/yr-35.1%16.8% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/cal-spa-filters/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.
0%10%$2K20%$4K30%$6K40%$8K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**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**$39.24**4.6★108 rev](https://www.amazon.com/dp/B0BM5C6P16) [2**Malaka Spa Replacement Filter FD2007 Compatible with PWW50L 4CH-949 FC-0172 Hot Tub Replacement Filter Cartridge 2-Pack**Malaka**$45.15**4.6★707 rev](https://www.amazon.com/dp/B094934ZZJ) [3**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**$40.50**4.7★695 rev](https://www.amazon.com/dp/B09B37M9M8) [4**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**$26.36**4.7★1,012 rev](https://www.amazon.com/dp/B0894LM21V) [5**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**$30.17**4.8★6 rev](https://www.amazon.com/dp/B0GCYVTT6G)
**~~View all top sellers →~~**
### **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**$30.17**6 rev6mo ago](https://www.amazon.com/dp/B0GCYVTT6G) [**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**$27.49**51 rev11mo ago](https://www.amazon.com/dp/B0FMY1S89Z) [**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**$28.73**3 rev12mo ago](https://www.amazon.com/dp/B0FK4WL8BD) [**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**$29.43**27 rev1y ago](https://www.amazon.com/dp/B0FBQZBMLP) [**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**$32.05**145 rev1y ago](https://www.amazon.com/dp/B0DH2HCL6M)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**$27.49**4.7★**▲ 169%**](https://www.amazon.com/dp/B0FMY1S89Z) [**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**$29.43**4.7★**▲ 155%**](https://www.amazon.com/dp/B0FBQZBMLP) [**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**$28.73**4.4★**▲ 123%**](https://www.amazon.com/dp/B0FK4WL8BD) [**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**$30.17**4.8★**▲ 121%**](https://www.amazon.com/dp/B0GCYVTT6G) [**Cryspool 07043 Filter Compatible with Caldera 75 C-7375 1019301 73531 PCD75N FC-3964 75 Sq. Ft Spa Filter Cartridge 1 Pack**Cryspool**$41.64**4.6★**▲ 105%**](https://www.amazon.com/dp/B0BHL2SFT8)
**~~View all trending →~~**
## **What buyers say about cal spa filters**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**28%
*“Fit perfectly”*
**Filtration**21%
*“The water cleared up nicely after install”*
**Value For Money**13%
*“Good value”*
**Advertised Vs Actual Product**12%
*“work as intended”*
**Quality-Overall**11%
*“Excellent quality and fast delivery”*
**Ease Of Cleaning**3%
*“We'll see how well it cleans up”*
**Design-Overall**2%
*“Build quailty looks equally good”*
**Durability**2%
*“They are durable”*
**Strength**1%
*“theyre solid and functional”*
**Material Quality**1%
*“The material seems very durable”*
### **What buyers complain about **
**Filtration**37%
*“not as good as guardian filters”*
**Quality-Overall**11%
*“This is a cheap, irresponsible, wasteful, deceitful product”*
**Size-Overall**11%
*“Didn't fit”*
**Water Resistance**6%
*“Do NOT use in a salt water spa”*
**Thickness**6%
*“This filter seems to have thicker material than what we usually purchase”*
**Product Condition**6%
*“Was sent a USED filter in worse condition than the one I was trying to replace”*
**Durability**6%
*“windings are coming apart already”*
**Assembly/Installation**4%
*“it still was not ready to install”*
**Value For Money**4%
*“$15/filter and just toss the used filter in the garbage”*
### **Top return reasons **
**Size-Overall**69%
**Filtration**18%
**Advertised Vs Actual Product**7%
**Connectivity-Overall**1%
**Compatibility-Overall**1%
**Value For Money**1%
**Add-Ons/Attachments**1%
**Functionality-Overall**0%
**Defective Material/Parts**0%
**Measurement/Reading Accuracy**0%
## **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.
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