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Kalk

Fail

The top 5 brands take 98% of clicks, so Kalk is a Fail.

Flapen Score
38
38 / 100
Ranks 3,520 of 3,978 Pet Supplies niches · −13 vs the category median of 51
Market size
$41K/yr41K searches / yr
90-day growth
-8.6%search demand this quarter
Competition
75%top-5 click share · 6 brands · 16 sellers

Flapen Score

Kalk against its category

The dotted line is the Pet Supplies average. Past it, Kalk is stronger. Inside it, weaker.

38Fail
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The Kalk market on Amazon at a glance

Shoppers on Amazon United States searched for Kalk 41K times last year and spent an estimated $41K. The top 5 brands take 98% of clicks. Flapen scores it 38 out of 100, a Fail.

01 · Demand

An estimated 4.5% of those searches ended in a purchase.

Shoppers searched for this 41K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 4.5% of those searches ended in a purchase. Searches in the last 90 days moved -8.6% against the 90 days before. Searches, conversion and average price together put the market at an estimated $41K a year.

Searches, last 12 months
41K
Growth, 90 days vs prior 90
-8.6%
Conversion, latest week
4.5%
Market size, estimated
$41Ka year
Top search term
kalk23K searches a year

02 · Price

A sale here is worth $21.62.

Listings sell for $21.62 on average, from $7.34 to $51.54. Amazon reports units sold in ranges. This niche sold 2K to 2K a year. The average listing sells 0 to 100 of them. At $21.62 that is $0 to $2K a year per listing.

Average price
$21.62inside the $15 to $100 sweet spot
Price range
$7.34–$51.54
Amazon United States median price
$24.38across 115,062 niches
Units sold a year
2K–2K
Units per listing a year
0–100
Revenue per listing a year
$0–$2K
Returns
1.3%of orders · Amazon United States median 2.1%

03 · Entry bar

The bar here is low.

42% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 10.0% of listings are out of stock. The average listing ranks #750 within Fish & Aquatic Pets. It carries 174 reviews at 4.64 stars, so a new listing needs social proof before a better product.

Sponsored listings
42%
Prime listings
100%
Out of stock, average day
10.0%
Average rank
#750in Fish & Aquatic Pets
Average rating
4.64 starsAmazon United States average 4.42 stars
Average reviews
174per listing
Listings tracked
12

04 · Newcomers

0 of last year's 2 launches cleared the first-year sales bar.

2 products launched here in the last 12 months. 0 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 134 months on average, so the names here are established.

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

Products

Top Kalk products & what they sell for

The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.

Prices and ratings read from Amazon on Jul 17, 2026. The live listing can differ.

Competition

Competition: brands, sellers & click share

The top 5 products take an estimated 75% of clicks. A locked shelf that new listings rarely crack.

$0$4K$8K$12K$16K1101001K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

6 flat

Sellers

16

Est. top-5 brand share

98%

Top 20: 100%

Est. top-5 click share

75%

Top 20: 100%

Open market

0%

  • Seachem41%
  • Brightwell Aquatics33%
  • Continuum Aquatics12%
  • Bulk Reef Supply10%
  • Gingerbread Pet Supply2%
  • Perfect Corals2%
  • Open — no brand owns it (0%)

Demand

Kalk search demand

Weekly searches over the year. Pick a range.

800600Apr '26Apr '26May '26May '26May '26Jun '26Jun '26Jul '26

Search terms

Top Kalk search terms shoppers use

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

  • kalk23K/yr
  • kalkwasser11K/yr
  • kalkwasser for reef tank8K/yr

Reviews and returns

What reviews say buyers love and hate about Kalk

We read the reviews and the return reasons for every product selling here.

33%of positive reviews mention “Quality-Overall”
1.3%of orders come back
“Great product”
A buyer, on “Quality-Overall”33% of positive reviews mention the same topic

Every topic

Every topic buyers talk about, one row each.

Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.

12 topics

NegativePositive

FAQ

Common Kalk questions

Answered from the same tracked data.

Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data