---
title: "Hayward De4820 Filter Grids — $104K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/hayward-de4820-filter-grids"
last_updated: "2026-08-07T21:26:48.437Z"
locale: en
meta:
description: "Niche score 56/100 · $104K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 56/100 · $104K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Hayward De4820 Filter Grids — $104K/yr Amazon US Niche (2026) - Flapen"
---
# **hayward de4820 filter grids**
**Worth a look**
Shows demand growing +150.2% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 26Growth 96Conversion 62Competition 32Returns 61Price range 0Avg price 48Brand share 66Review moat 91Quality gap 76
**Growth**
**Incredible****+150.2%**
90-day search growth — must beat 0% to launch
**Review moat**
**Great****170.12**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Good****66%**
top-5 brand share — brands hold most of the demand
**Conversion**
**Good****5.4%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Good****2.6%**
return rate — above 5% kills the launch gate
**Avg price**
**Okay****$188.50**
avg listing price — sweet spot $15–$100
**Competition**
**Okay****66%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Okay****$104K**
$104K/yr · 10K searches
**Price range**
**Bad****$122.30–$335.56**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)") [** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, hayward de4820 filter grids is a $104K/yr Amazon United States market (10K searches/yr). The top 5 brands hold 66% of demand. Demand peaks in Apr–May–Jun–Jul–Aug. Verdict: Worth a look — 56/100.
Data updated Jul 24, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **hayward de4820 filter grids market data**
- **Units sold / yr**
- **500–750**
- avg 0–100/product
- **Revenue / yr**
- **$94K–$141K**
- units × avg price
- **Conversion rate**
- **5.4%**
- **Avg BSR**
- **#3,159**
- **Page quality**
- **0%**
- **Prime**
- **94%**
- **Sponsored**
- **100%**
- **Out of stock**
- **10.6%**
- **Avg brand age**
- **38 months**
- **Avg seller age**
- **186 days**
## **Competition & brand share**
The top 5 products take 66% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**17 **▼falling
**Sellers**
**38**
**Top-5 brand share**
**66%**
Top 20: 100%
**Top-5 click share**
**66%**
Top 20: 100%
**Open market**
**29%**
- Cryspool26% - Aumzong17% - Pentair9% - POOLPURE8% - CPLIKE6% - Unicel5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +150.2% search growth over the last 90 days.
600400Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, May, Jun, Jul, Aug · busiest ÷ quietest = 9.3×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/hayward-de4820-filter-grids/trend)
## **Top hayward de4820 filter grids 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%$10K20%$21K30%$31K40%$42K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted
All 17 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Cryspool 1004 DE Filter Compatible with FNS Plus 48 DEL/DEV 48 DE4820 59002300 FS-2004 PFS2448 FC-9540 PG-1904 7 Full + 1 Partial 48 Sq.Ft DE Grid Swimming Pool Filter Cartridge 1 Set**Cryspool**$153.41**4.7★119 rev](https://www.amazon.com/dp/B0CHXZC6GV) [2**Aumzong 48 sq Swimming DE Pool Filter Grids Compatible with Hayward Pro-Grid DE4820 Micro Clear DE4800 and DE480S for Penair FNS Plus Grid Set 48 Sq.Ft. (24 inch Height)**Aumzong**$140.82**4.5★117 rev](https://www.amazon.com/dp/B0D3DZF53R) [3**Pentair Grid Assembly PacFab FNS Plus 48 sqft**Pentair**$335.56**4.7★1,014 rev](https://www.amazon.com/dp/B001E06892) [4**POOLPURE FS-2004 DE Grid Pool Filter Replace FNS Plus 48 59002300 Jandy DEL/DEV48 Hayward DE4820 DEX4800DA DE4800 PFS2448 FC-9540 PG-1904 48 Sq Ft DE Grid 24 High 7 Full+1 Partial**POOLPURE**$149.19**4.6★478 rev](https://www.amazon.com/dp/B0CLNVRXPP) [5**CPLIKE 48 Sq.Ft FS-2004 DE Grid Pool Replacement Filt-er Set Compatible with Unicel FS-2004 for Hayward Pro-Grid DE4820 for MicroClear DE4800 7 Full + 1 Partial for 48 Sq.Ft (24 inch Height)**CPLIKE**$133.16**4.2★124 rev](https://www.amazon.com/dp/B0DM5BJ9DZ)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Orvex 59023400 Complete Filter Grid Assembly Cassette Compatible with Pentair 48 Sq Ft DE Filters FNS Plus with Manifolds to Prevent Cracking & Leaks**Orvex**$270.29**8 rev6mo ago](https://www.amazon.com/dp/B0GF1GPP3N) [**A-Outsanding 48 Sq.Ft Filter Grid Assembly Replacement for Pentair FNS Plus FNSP48 Pool Spa Filter Replaces #59023400**A-Outsanding**$245.34**2 rev6mo ago](https://www.amazon.com/dp/B0GDZFGNS5) [**KGC 48 Sq.Ft DE Filter Grids Pool Filter Replace for Hayward DE4820 - Swimming Pool Filter for Unicel FS-2004 PFS2448 FC-9540 for MicroClear DE4800 48 Sq Ft DE Grid 24 High 7 Full + 1 Partial**KGC**$129.28**18 rev6mo ago](https://www.amazon.com/dp/B0GCTWW6SF) [**59002500 Complete Element Grid Assembly for Pentair FNS Plus 48 Sq Ft Vertical and Spa Filter Replacement Pentair 59023400 and FNSP48 Filter Element Cluster Assembly Include De Filter Grids 48 Sq Ft**Nestly**$322.32**0 rev7mo ago](https://www.amazon.com/dp/B0GCHZXLKZ) [**AmiBron PFS2448 DE Pool Filter Grids 48 Sq.Ft Compatible with Hayward Pro-Grid DE4820 MicroClear DE4800 Jandy del/dev48 FS-2004 FC-9540 FNS Plus 48 24 High (7 Full 1 Partial) 1 Set**AmiBron**$124.70**3 rev8mo ago](https://www.amazon.com/dp/B0G36HJQFQ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**59002500 Complete Element Grid Assembly for Pentair FNS Plus 48 Sq Ft Vertical and Spa Filter Replacement Pentair 59023400 and FNSP48 Filter Element Cluster Assembly Include De Filter Grids 48 Sq Ft**Nestly**$322.32**0.0★**▲ 100%**](https://www.amazon.com/dp/B0GCHZXLKZ) [**KGC 48 Sq.Ft DE Filter Grids Pool Filter Replace for Hayward DE4820 - Swimming Pool Filter for Unicel FS-2004 PFS2448 FC-9540 for MicroClear DE4800 48 Sq Ft DE Grid 24 High 7 Full + 1 Partial**KGC**$129.28**4.0★**▲ 94%**](https://www.amazon.com/dp/B0GCTWW6SF) [**TOREAD FS-2004 DE Filter Grids 48 Sq.Ft Swimming Pool Filter Replace Hayward DE4820 DEX4800DA Unicel PFS2448 Filbur FC-9540 FNS Plus 48 DEL DEV 48 59002300**TOREAD**$137.43**4.8★**▲ 62%**](https://www.amazon.com/dp/B0DDTGWBTR) [**Poolzilla 48 Square Foot DE Grid Replacement - Compatible with Pleatco PFS2448 Unicel FS-2004 Filbur FC-9540-24 High (7 Full 1 Partial) Swimming Pool Filter Cartridges**Poolzilla**$122.30**4.2★**▲ 56%**](https://www.amazon.com/dp/B0C7PX5XWZ) [**A-Outsanding 48 Sq.Ft Filter Grid Assembly Replacement for Pentair FNS Plus FNSP48 Pool Spa Filter Replaces #59023400**A-Outsanding**$245.34**4.0★**▲ 29%**](https://www.amazon.com/dp/B0GDZFGNS5)
**~~View all trending →~~**
## **What buyers say about hayward de4820 filter grids**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**21%
*“Fit great”*
**Filtration**18%
*“They filter effectively”*
**Value For Money**15%
*“Worth It”*
**Quality-Overall**14%
*“look well made”*
**Assembly/Installation**8%
*“Easy install”*
**Advertised Vs Actual Product**7%
*“worked as promised”*
**Ease Of Cleaning**2%
*“the pool is truly clean”*
**Durability**2%
*“Very durable overall”*
**Ease Of Use**1%
*“Nice and easy”*
**Leak-Proof**1%
*“The air bleed assembly worked properly with no leaks after installation”*
### **What buyers complain about **
**Filtration**23%
*“Garbage filter”*
**Durability**11%
*“will begin to tear”*
**Quality-Overall**5%
*“QUALITY CONTROL IS NOT HIGH ON THEIR LIST”*
**Pressure**4%
*“Some of the internal ribs also crack under the pressure of the DE and trapped dirt, causing the grid structure to collapse”*
**Adhesion/Stickiness**4%
*“The DE didnt adhere to the grids”*
**Thickness**3%
*“These replacement grids are much thinner at the top collars”*
**Ease Of Cleaning**2%
*“harder to clean”*
**Functionality-Overall**2%
*“These did not work for me”*
**Design-Overall**2%
*“Broken part”*
**Leak-Proof**2%
*“DE would leach into my pool”*
### **Top return reasons **
**Size-Overall**57%
**Filtration**21%
**Advertised Vs Actual Product**7%
**Defective Material/Parts**2%
**Product Condition**2%
**Quality-Overall**2%
**Value For Money**2%
**Assembly/Installation**2%
**Material Quality**1%
**Leak-Proof**1%
## **Common questions**
- **Is hayward de4820 filter grids profitable to sell on Amazon United States?**
- The niche generates $104K/yr across 17 tracked products. 5 of 6 products launched in the last 360 days are still selling. 90-day search growth is +150.2%. Flapen's verdict: Worth a look (56/100).
- **How competitive is the hayward de4820 filter grids niche?**
- 17 brands and 38 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 66% of demand.
- **What do buyers complain about in hayward de4820 filter grids?**
- Top complaints mined from reviews: Filtration, Durability, Quality-Overall. The return rate is 2.6%.
- **When does demand for hayward de4820 filter grids peak?**
- Demand peaks in Apr–May–Jun–Jul–Aug; the busiest month runs 9.3× the quietest.
- **What does it cost to enter the hayward de4820 filter grids niche?**
- Listings span $122.30–$335.56; the average listing price is $188.50 (sweet spot $15–$100). The average incumbent carries 170 reviews — the moat a new listing must climb.
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