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.

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.

Conversion

Incredible20.3%

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

Returns

Great1.0%

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

Good817.47

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

Okay84%

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

Competition

Okay66%

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

Quality gap

Bad4.7★

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

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

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.

Peak months: May, Jun · busiest ÷ quietest = 2.0×

Open 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.

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

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$24.744.7★3,790 rev

Unicel C-4950 50 Square Foot Media Replacement Pool Hot Tub Spa Filter Cartridge with 212 Pleats

Unicel$30.864.8★894 rev

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$20.644.8★1,100 rev

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$30.754.6★88 rev

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$47.404.7★3,790 rev

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$33.7515 rev

6mo ago

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$30.7588 rev

1y ago

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$24.2437 rev

1y ago

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$23.1722 rev

2y ago

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$33.13203 rev

2y ago

What buyers say about unicel c-4950 spa filter

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

What buyers love

Filtration36%

“Good filter”

Size-Overall19%

“Correct size”

Value For Money17%

“Cost effective”

Quality-Overall8%

“Excellent product”

Advertised Vs Actual Product7%

“Works as Advertised”

Durability3%

“Lasts well and seems good quality”

Ease Of Cleaning3%

“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 Use1%

“Its useable”

Material Quality1%

“The material is of very durable quality”

Water Resistance1%

“keep the spa water clear”

What buyers complain about

Filtration38%

“They float around in the filter housing unit, therefore they do not filter adequately”

Size-Overall31%

“Did not fit our tub despite it saying it would”

Smell4%

“smelly/dirty water no matter what I did”

Value For Money4%

“They are a bit expensive”

Top return reasons

Size-Overall67%

Filtration17%

Advertised Vs Actual Product9%

Value For Money1%

Defective Material/Parts1%

Functionality-Overall1%

Add-Ons/Attachments1%

Shape/Style1%

Maintenance And Repair0%

Mechanism Issues0%

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.