---
title: "Caustic Soda — £366K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/grocery/caustic-soda"
last_updated: "2026-07-31T15:57:27.550Z"
locale: en
meta:
description: "Niche score 51/100 · £366K/yr market · 229K searches/yr. A concentrated shelf (top 5 take 83% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 51/100 · £366K/yr market · 229K searches/yr. A concentrated shelf (top 5 take 83% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Caustic Soda — £366K/yr Amazon UK Niche (2026) - Flapen"
---
# **caustic soda**
**Worth a look**
Shows low returns (0.1%), but a concentrated shelf (top 5 take 83% of clicks) keeps it on the watch list.
Market size 54Growth 23Conversion 96Competition 14Returns 99Price range 62Avg price 46Brand share 25Review moat 83Quality gap 62
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****13.9%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Great****330.42**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Price range**
**Good****£3.35–£34.26**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Good****£366K**
£366K/yr · 229K searches
**Avg price**
**Okay****£11.47**
avg listing price — sweet spot $15–$100
**Brand share**
**Okay****90%**
top-5 brand share — brands hold most of the demand
**Growth**
**Bad****-4.8%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****83%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United Kingdom niche tracking, caustic soda is a £366K/yr Amazon United Kingdom market (229K searches/yr). The top 5 brands hold 90% of demand. Verdict: Worth a look — 51/100.
Data updated Jul 24, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **caustic soda market data**
- **Units sold / yr**
- **30K–40K**
- avg 2,000–2,500/product
- **Revenue / yr**
- **£344K–£459K**
- units × avg price
- **Conversion rate**
- **13.9%**
- **Avg BSR**
- **#94**
- **Page quality**
- **0%**
- **Prime**
- **67%**
- **Sponsored**
- **83%**
- **Out of stock**
- **1.0%**
- **Avg brand age**
- **38 months**
- **Avg seller age**
- **168 days**
## **Competition & brand share**
The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**9 **▲rising
**Sellers**
**24**
**Top-5 brand share**
**90%**
Top 20: 100%
**Top-5 click share**
**83%**
Top 20: 100%
**Open market**
**7%**
- Max34% - EasyClean26% - Epished17% - The Retail Heaven10% - Thomas Bewick3% - MUSON TRADE3% - Open — no brand owns it (3 brands, 7%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -4.8% search growth over the last 90 days.
5K3KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/uk/grocery/caustic-soda/trend)
## **Top caustic soda search terms**
- **caustic soda**140K/yr-1.2%12.9% conv. - **caustic soda drain unblocker**51K/yr-19.7%13.3% conv. - **caustic soda max strength**11K/yr+38.3%12.1% conv. - **caustic soda crystals**12K/yr-24.5%10.3% conv. - **caustic soda powder**7K/yr+31.4%7.0% conv. - **costick soda drain cleaner**6K/yr-10.1%11.6% conv. - **costick soda**3K/yr-11.7%12.8% conv. [**All search terms **](https://flapen.com/research/uk/grocery/caustic-soda/search-terms)
## **Top caustic soda 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%£37K20%£73K30%£110K40%£147K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 12 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Powerful Caustic Soda Drain Cleaner | Effective Clog Remover Industrial Strength Formula Fast Action (3 X 375gm) (Packaging may vary)**EasyClean**£8.88**4.3★632 rev](https://www.amazon.co.uk/dp/B0D3LYGFJZ) [2**Max Strength Caustic Soda High Performance Caustic Soda Drain Unblocker and Degreaser Powerful Sodium Hydroxide for Bins Toilets Drains Concrete Paths and More 1kg - Made in the UK**Max**£7.13**4.5★313 rev](https://www.amazon.co.uk/dp/B0F3JPWDGD) [3**Powerful Drain Cleaner & Unblocker 1KG Caustic Soda Crystals | Heavy Duty Sink & Pipe Unblocker for Grease Hair & Organic Waste | Fast-Acting Professional Strength Formula**Epished**£6.14**4.5★82 rev](https://www.amazon.co.uk/dp/B0GF2JF6CZ) [4**Powerful Drain Cleaner & Unblocker l 1KG Caustic Soda | Fast-Acting Heavy-Duty Sink & Drain Cleaner | Strong & Effective | The Original & Best l Works 3x Better Than Bleach (Packaging Varies)**The Retail Heaven**£7.54**4.3★1,704 rev](https://www.amazon.co.uk/dp/B0BW63NBHD) [5**Max Strength Caustic Soda High Performance Caustic Soda Drain Unblocker and Degreaser Powerful Sodium Hydroxide for Bins Toilets Drains Concrete Paths and More 500g - Made in the UK**Max**£4.88**4.4★156 rev](https://www.amazon.co.uk/dp/B0F3JS9792)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Powerful Drain Cleaner & Unblocker 1KG Caustic Soda Crystals | Heavy Duty Sink & Pipe Unblocker for Grease Hair & Organic Waste | Fast-Acting Professional Strength Formula**Epished**£6.14**82 rev6mo ago](https://www.amazon.co.uk/dp/B0GF2JF6CZ) [**5 Kg Drain Unblocker | Caustic Soda | Professional Grade Drain Cleaner Commercial Kitchen Degreaser Soap & Chemical Manufacturing Textile & Water Treatment Use | 5Kg**Thomas Bewick**£34.26**39 rev10mo ago](https://www.amazon.co.uk/dp/B0FRMXTBB6) [**Max Strength Caustic Soda High Performance Caustic Soda Drain Unblocker and Degreaser Powerful Sodium Hydroxide for Bins Toilets Drains Concrete Paths and More 1kg - Made in the UK**Max**£7.13**313 rev1y ago](https://www.amazon.co.uk/dp/B0F3JPWDGD) [**Max Strength Caustic Soda High Performance Caustic Soda Drain Unblocker and Degreaser Powerful Sodium Hydroxide for Bins Toilets Drains Concrete Paths and More 500g - Made in the UK**Max**£4.88**156 rev1y ago](https://www.amazon.co.uk/dp/B0F3JS9792) [**Max Traditional Soda Crystals 450g - Remove Stubborn Grease and Stains - Powerful Multipurpose Dishwasher Washing Machine Cleaner - Fast Acting Soda Crystals with Lasting Results**Max**£3.35**204 rev1y ago](https://www.amazon.co.uk/dp/B0B2LTYZ49)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**MUSON Caustic Soda 5KG | Professional Drain Unblocker & Grease Remover | Sodium Hydroxide 98% | Heavy Duty Sink & Pipe Cleaner**MUSON TRADE**£30.24**4.2★**▲ 270%**](https://www.amazon.co.uk/dp/B0D9KJRZ4Q) [**Powerful Drain Cleaner & Unblocker 1KG Caustic Soda Crystals | Heavy Duty Sink & Pipe Unblocker for Grease Hair & Organic Waste | Fast-Acting Professional Strength Formula**Epished**£6.14**4.5★**▲ 94%**](https://www.amazon.co.uk/dp/B0GF2JF6CZ) [**Max Strength Caustic Soda High Performance Caustic Soda Drain Unblocker and Degreaser Powerful Sodium Hydroxide for Bins Toilets Drains Concrete Paths and More 500g - Made in the UK**Max**£4.88**4.4★**▲ 31%**](https://www.amazon.co.uk/dp/B0F3JS9792) [**Sodium Hydroxide Caustic soda powder Lye for soap making Sink unblocker the best drain cleaners and unblockers Strongest toilet unblocker kitchen sink unblocker drain cleaner sink cleaner 1KG**Spartax**£11.16**4.7★**▲ 18%**](https://www.amazon.co.uk/dp/B0DLP6QM9G) [**Max Strength Caustic Soda High Performance Caustic Soda Drain Unblocker and Degreaser Powerful Sodium Hydroxide for Bins Toilets Drains Concrete Paths and More 1kg - Made in the UK**Max**£7.13**4.5★**▲ 11%**](https://www.amazon.co.uk/dp/B0F3JPWDGD)
**~~View all trending →~~**
## **What buyers say about caustic soda**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**18%
*“Good brand use for washing powder”*
**Value For Money**17%
*“Great Value”*
**Advertised Vs Actual Product**17%
*“As advertised”*
**Strength**10%
*“Very strong”*
**Ease Of Use**7%
*“Easy to Use”*
**Ease Of Cleaning**7%
*“cleaning etc handy to have”*
**Efficiency**5%
*“The item does do what it says”*
**Functionality-Overall**3%
*“Does the job where other solutions don't”*
**Washability**2%
*“washing up liquid does a better job”*
**Instructions/User Manual/Troubleshooting**2%
*“the safety instructions are clear”*
### **What buyers complain about **
**Functionality-Overall**30%
*“Did not work for”*
**Strength**17%
*“Not Strong Enough”*
**Value For Money**8%
*“not cheaper though”*
**Instructions/User Manual/Troubleshooting**4%
*“Does nothing followed instructions and just nothing”*
**Solubility**3%
*“it doesnt dissolve”*
**Side Effects**3%
*“Did absolutely nothing did not behave like caustic soda at all”*
**Contamination**3%
*“the caustic soda spilled out onto the floor”*
**Visibility**3%
*“Didn't clear”*
**Stain Resistance**1%
*“Today I used it on a small stainless teapot that was stubbornly stained”*
**Jamming/Clogging**1%
*“the drain was still clogged”*
### **Top return reasons **
**Leak-Proof**26%
**Functionality-Overall**25%
**Advertised Vs Actual Product**9%
**Instructions/User Manual/Troubleshooting**6%
**Quality-Overall**5%
**Stain Resistance**5%
**Hard Feel**5%
**Product Condition**2%
**Size-Overall**2%
**Value For Money**2%
## **Common questions**
- **Is caustic soda profitable to sell on Amazon United Kingdom?**
- The niche generates £366K/yr across 12 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -4.8%. Flapen's verdict: Worth a look (51/100).
- **How competitive is the caustic soda niche?**
- 9 brands and 24 sellers compete. The top 5 products take 83% of clicks and top 5 brands hold 90% of demand.
- **What do buyers complain about in caustic soda?**
- Top complaints mined from reviews: Functionality-Overall, Strength, Value For Money. The return rate is 0.1%.
- **When does demand for caustic soda peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the caustic soda niche?**
- Listings span £3.35–£34.26; the average listing price is £11.47 (sweet spot $15–$100). The average incumbent carries 330 reviews — the moat a new listing must climb.
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