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Cistern Blocks

Fail

Prices span $1.03–$14.85, mostly outside the sweet spot, so Cistern Blocks is a Fail.

Flapen Score
49
49 / 100
Top 36% of 2,976 Grocery niches · +3 vs the category median of 46
Market size
£57K/yr106K searches / yr
90-day growth
-17.3%search demand this quarter
Competition
48%top-5 click share · 14 brands · 165 sellers

Flapen Score

Cistern Blocks against its category

The dotted line is the Grocery average. Past it, Cistern Blocks is stronger. Inside it, weaker.

49Fail
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The Cistern Blocks market on Amazon at a glance

Shoppers on Amazon United Kingdom searched for Cistern Blocks 106K times last year and spent an estimated £57K. The top 5 brands take 79% of clicks. Demand peaks in Jan–Feb–Aug. Flapen scores it 49 out of 100, a Fail.

01 · Demand

8.8% of searches ended in a purchase last week.

Shoppers searched for this 106K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. In the latest week, 8.8% of those searches ended in a purchase. Searches in the last 90 days moved -17.3% against the 90 days before. Searches, conversion and average price together put the market at an estimated £57K a year.

Searches, last 12 months
106K
Growth, 90 days vs prior 90
-17.3%
Conversion, latest week
8.8%
Market size, estimated
£57Ka year
Peak month
January2.4× the quietest month
Top search term
cistern blocks56K searches a year

02 · Price

A sale here is worth £6.16.

Listings sell for £6.16 on average, from £1.03 to £14.85. Amazon reports units sold in ranges. This niche sold 10K to 13K a year. The average listing sells 250 to 500 of them. At £6.16 that is £2K to £3K a year per listing.

Average price
£6.16under the $15 to $100 sweet spot
Price range
£1.03–£14.85
Amazon United Kingdom median price
£12.12across 27,606 niches
Units sold a year
10K–13K
Units per listing a year
250–500
Revenue per listing a year
£2K–£3K
Returns
0.1%of orders · Amazon United Kingdom median 0.6%

03 · Entry bar

The bar here is reviews.

81% of listings pay for placement with sponsored ads. 85% ship with Prime. On an average day, 7.2% of listings are out of stock. The average listing ranks #120 within Household Cleaners. It carries 2,343 reviews at 4.04 stars, so a new listing needs social proof before a better product.

Sponsored listings
81%
Prime listings
85%
Out of stock, average day
7.2%
Average rank
#120in Household Cleaners
Average rating
4.04 starsAmazon United Kingdom average 4.36 stars
Average reviews
2,343per listing
Listings tracked
26

04 · Newcomers

Amazon counts 0 of last year's 2 launches as successful.

2 products launched here in the last 12 months. Amazon counts 0 of them as successful launches, new products that hit its first-year sales bar. The brands on the shelf have sold for 42 months on average, so the names here are settling in.

Launched, last 12 months
2
Successful launches
0Amazon's first-year sales bar
Average brand age
42 months

Products

Top Cistern Blocks products & what they sell for

Every tracked product: its share of the shelf, its reviews, and its price.

Competition

Competition: brands, sellers & click share

The top 5 products take 48% of clicks. Leaders hold, but buyers still shop past them.

£0£3K£6K£9K£11K101001K10K100K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

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

Cistern Blocks search demand

Weekly searches over the year, seasonality beneath. Pick a range.

5K3KSpike '24Spike '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Jan, Feb, Aug · busiest ÷ quietest = 2.4×

Search terms

Top Cistern Blocks search terms shoppers use

The exact words shoppers type, with yearly volume, growth, and conversion.

  • 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

Reviews and returns

What reviews say buyers love and hate about Cistern Blocks

What buyers praise, what they complain about and why they send it back, from the reviews.

Complain

Durability22%−0.31

Didn't even last a month

Doesn't last

eventually broke down

Functionality-Overall13%−0.19

not effective

Didn't work for me

They do not work as expected

Color10%−0.04

Not colour change

Not blue

No colour

Value For Money9%+0.68

A little bit pricey

Not worth it

WASTE OF MONEY

Smell8%+0.51

No real scent as far as I can tell

Hardly any smell at all

Absolutely no smell of lavender at all

Love

Value For Money15%+0.68

Money well spent

Great value

Good value for money

Ease Of Cleaning13%+0.83

They provide effective cleaning

They are quite effective in cleaning toilets

definitely easier to clean

Advertised Vs Actual Product11%+0.65

As described

As advertised

Performs as described

Smell10%+0.51

Smell clean well

Great smell

Smells fresh

Quality-Overall9%+0.36

Excellent product

Very good quality

Decent

Return

0.1% Return rate 27% Fixable by listing

Functionality-Overall25%▄█▄▇▁▅

not effective

Didn't work for me

They do not work as expected

Color19%▆▁▅▁█▇

Not colour change

Not blue

No colour

Durability9%▆▄▄▇█▃

Didn't even last a month

Doesn't last

eventually broke down

Leak-Proof7%█▇▁▁▁▅
Smell7%▁▁▃█▁▅

No real scent as far as I can tell

Hardly any smell at all

Absolutely no smell of lavender at all

FAQ

Common Cistern Blocks questions

Answered from the same tracked data.