cistern blocks
Skip itPrices mostly outside the sweet spot ($1.03–$14.85) — this niche doesn't clear our bar today.
Returns
Incredible0.1%return rate — above 5% kills the launch gate
Quality gap
Great4.0★avg incumbent rating — lower means beatable quality
Conversion
Great8.8%search→purchase rate — share of searches ending in a sale
Competition
Good48%top-5 click share — leaders hold, buyers still browse
Brand share
Okay79%top-5 brand share — brands hold most of the demand
Review moat
Okay2,343.27avg incumbent reviews — the moat a new listing must climb
Avg price
Bad£6.16avg listing price — sweet spot $15–$100
Growth
Bad-17.3%90-day search growth — must beat 0% to launch
Market size
Bad£57K£57K/yr · 106K searches
Price range
Bad£1.03–£14.85cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, cistern blocks is a £57K/yr Amazon United Kingdom market (106K searches/yr). The top 5 brands hold 79% of demand. Demand peaks in Jan–Feb–Aug. Verdict: Skip it — 49/100.
Data updated Jul 24, 2026 · scored weekly · How we score niches
cistern blocks market data
- Units sold / yr
- 10K–13K
- avg 250–500/product
- Revenue / yr
- £62K–£77K
- units × avg price
- Conversion rate
- 8.8%
- Avg BSR
- #120
- Page quality
- 0%
- Prime
- 85%
- Sponsored
- 81%
- Out of stock
- 7.2%
- Avg brand age
- 42 months
- Avg seller age
- 168 days
Competition & brand share
The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.Brands
14 falling
Sellers
165
Top-5 brand share
79%
Top 20: 100%
Top-5 click share
48%
Top 20: 93%
Open market
16%
- Bloo34%
- Ecozone23%
- SOL10%
- easylife lifestyle solutions6%
- by Amazon6%
- Instant Power5%
- Open — no brand owns it (8 brands, 16%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -17.3% search growth over the last 90 days.Peak months: Jan, Feb, Aug · busiest ÷ quietest = 2.4×
Top cistern blocks search terms
- cistern blocks56K/yr
- total toilet 2000 flushes 7 in 116K/yr
- toilet cistern cleaner14K/yr
- total toilet8K/yr
- cistern cleaner6K/yr
- bloo cistern blocks5K/yr
- parazone bleach blocks for toilet cistern1K/yr
Top cistern blocks 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
EcoZone Forever Flush 2000 Blue Toilet Blocks Eco Friendly Alternative to Loo Rim Hangers Cistern Capsules Clean & Descale WCs Natural Vegan & Non Toxic Cleaner Recyclable Plastic (Set of 2)
Ecozone£8.784.0★4,640 rev
Bloo 3in1 Lemon Toilet Blocks Toilet Limescale Remover Cistern Block Toilet Cleaner Block with Cleaning and Foaming Action Toilet Fresheners Pack of 4
Bloo£2.124.4★4,644 rev
Bloo New 3in1 Toilet Blocks Pack of 2 Toilet Limescale Remover Cistern Block Toilet Cleaner Block with Cleaning and Foaming Action Toilet Fresheners - Limescale Prevention
Bloo£1.444.4★4,644 rev
EcoZone Forever Flush 2000 Purple Toilet Blocks Eco Friendly Alternative to Loo Rim Hangers Cistern Capsules Clean & Descale WCs Natural Vegan & Non Toxic Cleaner Recyclable Plastic (Set of 2)
Ecozone£7.583.3★1,935 rev
Easylife Flush 2000 Toilet Cleaner (Pack of 2) Toilet Freshener Lasts up to 2000 Flushes Works Within 24 Hours Biodegradable and Non-Toxic Bathroom Cleaning Products - Fully Guaranteed
easylife lifestyle solutions£7.833.4★100 rev
Newest
by launch date
by Amazon Toilet Cistern Block - Blue Blue 1 pack
by Amazon£1.03161 rev
Power Bleach Toilet Blocks Cistern Blocks Bleach Toilet Tablets 2 X 6 Pack
ABL Supplies£6.0580 rev
Upgraded Toilet Blocks for Cisterns 6PCS Triple Effect Toilet Cleaner with 3PCS Toilet Tank Cleaners Tablets with Bleach Toilet Bowl Cleaner Tablets Drop in Tank for Deodorizing & Descaling
Nunemosk£7.56155 rev
Sanicare PurpleLoo Toilet Cistern Blocks 24 Blocks 4 x 6 Pack
Sanicare£10.6115 rev
Sanicare PinkLoo Toilet Cistern Blocks 12 Blocks 2 x 6 Pack
Sanicare£7.43112 rev
Trending
90-day click momentumby Amazon Toilet Cistern Block - Blue Blue 1 pack
by Amazon£1.034.3★
Easylife Flush 2000 Toilet Cleaner (Pack of 2) Toilet Freshener Lasts up to 2000 Flushes Works Within 24 Hours Biodegradable and Non-Toxic Bathroom Cleaning Products - Fully Guaranteed
easylife lifestyle solutions£7.833.4★
Bloo 3in1 Toilet Blocks Pack of 4 Toilet Limescale Remover Cistern Block Toilet Cleaner Block with Cleaning and Foaming Action Toilet Fresheners Fresh Flowers
Bloo£3.734.4★
Bloo 3in1 Toilet Blocks Pack of 2 Limescale Remover Cistern Block Cleaner Block with Cleaning and Foaming Action Fresheners Lemon
Bloo£1.664.4★
24pk x 50g Toilet Blocks for Cisterns Blue Ocean Scent Freshener Tablets Cleaners Powerful Inside Rim and Bowl Cleaning Long-Lasting Fragrance Prevents Limescale and Effectively Fights Odours
SOL£7.743.5★
What buyers say about cistern blocks
What buyers praise and complain about, mined from review topics.What buyers love
“Money well spent”
“They provide effective cleaning”
“As described”
“Smell clean well”
“Excellent product”
“Nice colour”
“Do the job”
“lasting and effective”
“Ease of use”
“Freshness”
What buyers complain about
“Didn't even last a month”
“not effective”
“Not colour change”
“A little bit pricey”
“No real scent as far as I can tell”
“Poor quality”
“no great cleaning power”
“Not as advertised”
“waste”
“Cheap dissolve to quick”
Top return reasons
Common questions
- Is cistern blocks profitable to sell on Amazon United Kingdom?
- The niche generates £57K/yr across 26 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is -17.3%. Flapen's verdict: Skip it (49/100).
- How competitive is the cistern blocks niche?
- 14 brands and 165 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 79% of demand.
- What do buyers complain about in cistern blocks?
- Top complaints mined from reviews: Durability, Functionality-Overall, Color. The return rate is 0.1%.
- When does demand for cistern blocks peak?
- Demand peaks in Jan–Feb–Aug; the busiest month runs 2.4× the quietest.
- What does it cost to enter the cistern blocks niche?
- Listings span £1.03–£14.85; the average listing price is £6.16 (sweet spot $15–$100). The average incumbent carries 2,343 reviews — the moat a new listing must climb.