---
title: "Unicel C-4950 Spa Filter — $53K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/unicel-c-4950-spa-filter"
last_updated: "2026-08-05T23:42:37.047Z"
locale: en
meta:
description: "Niche score 53/100 · $53K/yr market · 8K searches/yr · $34.11 avg price. A small market ($53K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 53/100 · $53K/yr market · 8K searches/yr · $34.11 avg price. A small market ($53K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Unicel C-4950 Spa Filter — $53K/yr Amazon US Niche (2026) - Flapen"
---
# **unicel c-4950 spa filter**
**Worth a look**
Shows searches that convert (20.3% search→purchase), but a small market ($53K/yr) keeps it on the watch list.
Market size 13Growth 59Conversion 100Competition 31Returns 95Price range 95Avg price 95Brand share 35Review moat 67Quality gap 18
**Conversion**
**Incredible****20.3%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Great****1.0%**
return rate — above 5% kills the launch gate
**Avg price**
**Incredible****$34.11**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$18.24–$65.62**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****817.47**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Good****+33.7%**
90-day search growth — must beat 0% to launch
**Brand share**
**Okay****84%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****66%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$53K**
$53K/yr · 8K searches
According to Flapen's Amazon United States niche tracking, unicel c-4950 spa filter is a $53K/yr Amazon United States market (8K searches/yr). The top 5 brands hold 84% of demand. Demand peaks in May–Jun. Verdict: Worth a look — 53/100.
Data updated Jul 24, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **unicel c-4950 spa filter market data**
- **Units sold / yr**
- **2K–2K**
- avg 100–250/product
- **Revenue / yr**
- **$51K–$68K**
- units × avg price
- **Conversion rate**
- **20.3%**
- **Avg BSR**
- **#283**
- **Page quality**
- **0%**
- **Prime**
- **94%**
- **Sponsored**
- **94%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **36 months**
- **Avg seller age**
- **202 days**
## **Competition & brand share**
The top 5 products take 66% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▲rising
**Sellers**
**27**
**Top-5 brand share**
**84%**
Top 20: 100%
**Top-5 click share**
**66%**
Top 20: 100%
**Open market**
**13%**
- POOLPURE29% - Unicel23% - TOREAD17% - Grefilt8% - AmiBron7% - Wowreed3% - Open — no brand owns it (7 brands, 13%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +33.7% search growth over the last 90 days.
300200Spike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: May, Jun · busiest ÷ quietest = 2.0×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/unicel-c-4950-spa-filter/trend)
## **Top unicel c-4950 spa filter 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%5%$3K10%$5K15%$8K20%$11K101001K10K 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**POOLPURE PLFPRB50-IN Spa Filter Replaces Pleatco PRB50-IN PRB50IN Unicel C-4950 Filbur FC-2390 Jacuzzi J210/J220/J235/J245/J275 Guardian 413-212-02 373045 5X13 Drop in Hot Tub Filter 1 Pack**POOLPURE**$24.74**4.7★3,790 rev](https://www.amazon.com/dp/B07MTDB8KB) [2**Unicel C-4950 50 Square Foot Media Replacement Pool Hot Tub Spa Filter Cartridge with 212 Pleats**Unicel**$30.86**4.8★894 rev](https://www.amazon.com/dp/B000A4TDPO) [3**TOREAD TRF-4950 Spa Filter Replaces Unicel C-4950 Pleatco PRB50-IN Guardian 413-212-02 Filbur FC-2390 373045 03FIL1600 17-2380 Jacuzzi J210/J220/J235/J245/J275 5X13 Hot Tub Filter 1Pack**TOREAD**$20.64**4.8★1,100 rev](https://www.amazon.com/dp/B07ZKH1R3C) [4**Grefilt C-4950 Hot Tub Filter Compatible with PRB50-IN Hot Tub Filter Filbur FC-2390 J200 Guardian 413-212-02 5X13 Drop in 50 sq.ft 2-Pack**Grefilt**$30.75**4.6★88 rev](https://www.amazon.com/dp/B0FDB3CT8R) [5**POOLPURE PLFPRB50-IN Spa Filter Replaces Pleatco PRB50-IN PRB50IN Unicel C-4950 Filbur FC-2390 Jacuzzi J210/J220/J235/J245/J275 Guardian 413-212-02 373045 5X13 Drop in Hot Tub Filter 2 Pack**POOLPURE**$47.40**4.7★3,790 rev](https://www.amazon.com/dp/B07MTDKCM2)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**KGC PRB50-IN Hot Tub Filter Spa Replaces for PRB50 - Fits Unicel C-4950 Guardian 413-212-02 Filbur FC-2390 Spa Filters for J210/J220/J235/J245/J275 5X13 Drop in Hot Tub Filter 100 sq.ft 2 Pack**KGC**$33.75**15 rev6mo ago](https://www.amazon.com/dp/B0GCTDFQQ7) [**Grefilt C-4950 Hot Tub Filter Compatible with PRB50-IN Hot Tub Filter Filbur FC-2390 J200 Guardian 413-212-02 5X13 Drop in 50 sq.ft 2-Pack**Grefilt**$30.75**88 rev1y ago](https://www.amazon.com/dp/B0FDB3CT8R) [**Ying-ti 2 Pack PRB50 Spa Filter Replaces Pleatco PRB50-IN Unicel C-4950 Filbur FC-2390 Guardian 413-212-02 Filbur FC-2390 Jacuzzi J210/J220/J235/J245/J275 5X13 Hot Tub Filter**Ying-ti**$24.24**37 rev1y ago](https://www.amazon.com/dp/B0DX1LDNC4) [**FFyan Replacement Spa Filter Compatible with Pleatco PRB50-IN for Unicel C-4950 for Filbur FC-2390 for Guardian 413-212-02 373045 817-50000 3FIL1600 17-2380 2pcs Hot Tub Filter.**FFyan**$23.17**22 rev2y ago](https://www.amazon.com/dp/B0D832JS67) [**AmiBron C-4950 Spa Filters Replaces For Pleatco PRB50-IN Filbur FC-2390 03FIL1600 373045 Compatible For Jacuzzi J210/J220/J235/J245/J275 50 sq.ft 5X13 Drop in Hot Tub filter 2 Pack**AmiBron**$33.13**203 rev2y ago](https://www.amazon.com/dp/B0CSWSSJS4)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**AQUALTRA Spa Filter Compatible with PRB50-IN C-4950 FC-2390 J200/J210/J220/J235/J245/J275 Guardian 413-212-02 373045 13 5/16 x 5 Drop in Hot Tub Filter 2 Pack (White)**AQUALTRA**$30.81**4.8★**▲ 274%**](https://www.amazon.com/dp/B0CGLR9RF2) [**Ying-ti 2 Pack PRB50 Spa Filter Replaces Pleatco PRB50-IN Unicel C-4950 Filbur FC-2390 Guardian 413-212-02 Filbur FC-2390 Jacuzzi J210/J220/J235/J245/J275 5X13 Hot Tub Filter**Ying-ti**$24.24**4.4★**▲ 146%**](https://www.amazon.com/dp/B0DX1LDNC4) [**KGC PRB50-IN Hot Tub Filter Spa Replaces for PRB50 - Fits Unicel C-4950 Guardian 413-212-02 Filbur FC-2390 Spa Filters for J210/J220/J235/J245/J275 5X13 Drop in Hot Tub Filter 100 sq.ft 2 Pack**KGC**$33.75**4.9★**▲ 115%**](https://www.amazon.com/dp/B0GCTDFQQ7) [**FFyan Replacement Spa Filter Compatible with Pleatco PRB50-IN for Unicel C-4950 for Filbur FC-2390 for Guardian 413-212-02 373045 817-50000 3FIL1600 17-2380 2pcs Hot Tub Filter.**FFyan**$23.17**4.8★**▲ 91%**](https://www.amazon.com/dp/B0D832JS67) [**POOLPURE PLFPRB50-IN Spa Filter Replaces Pleatco PRB50-IN PRB50IN Unicel C-4950 Filbur FC-2390 Jacuzzi J210/J220/J235/J245/J275 Guardian 413-212-02 373045 5X13 Drop in Hot Tub Filter 2 Pack**POOLPURE**$47.40**4.7★**▲ 67%**](https://www.amazon.com/dp/B07MTDKCM2)
**~~View all trending →~~**
## **What buyers say about unicel c-4950 spa filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**36%
*“Good filter”*
**Size-Overall**19%
*“Correct size”*
**Value For Money**17%
*“Cost effective”*
**Quality-Overall**8%
*“Excellent product”*
**Advertised Vs Actual Product**7%
*“Works as Advertised”*
**Durability**3%
*“Lasts well and seems good quality”*
**Ease Of Cleaning**3%
*“Another benefit, this filter is really easy to rinse off - unlike the original one which stayed brown no matter how hard I sprayed it down, the dirt seems to rinse off on this one”*
**Ease Of Use**1%
*“Its useable”*
**Material Quality**1%
*“The material is of very durable quality”*
**Water Resistance**1%
*“keep the spa water clear”*
### **What buyers complain about **
**Filtration**38%
*“They float around in the filter housing unit, therefore they do not filter adequately”*
**Size-Overall**31%
*“Did not fit our tub despite it saying it would”*
**Smell**4%
*“smelly/dirty water no matter what I did”*
**Value For Money**4%
*“They are a bit expensive”*
### **Top return reasons **
**Size-Overall**67%
**Filtration**17%
**Advertised Vs Actual Product**9%
**Value For Money**1%
**Defective Material/Parts**1%
**Functionality-Overall**1%
**Add-Ons/Attachments**1%
**Shape/Style**1%
**Maintenance And Repair**0%
**Mechanism Issues**0%
## **Common questions**
- **Is unicel c-4950 spa filter profitable to sell on Amazon United States?**
- The niche generates $53K/yr across 17 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +33.7%. Flapen's verdict: Worth a look (53/100).
- **How competitive is the unicel c-4950 spa filter niche?**
- 13 brands and 27 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 84% of demand.
- **What do buyers complain about in unicel c-4950 spa filter?**
- Top complaints mined from reviews: Filtration, Size-Overall, Smell. The return rate is 1.0%.
- **When does demand for unicel c-4950 spa filter peak?**
- Demand peaks in May–Jun; the busiest month runs 2.0× the quietest.
- **What does it cost to enter the unicel c-4950 spa filter niche?**
- Listings span $18.24–$65.62; the average listing price is $34.11 (sweet spot $15–$100). The average incumbent carries 817 reviews — the moat a new listing must climb.
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