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Calcium Hardness Increaser

Pass

Calcium Hardness Increaser scores 66 out of 100, a Pass. Shoppers spend an estimated $1.7M a year here, search demand grew +313.5% this quarter, and an estimated 0.4% of orders come back.

Filters Trending
Flapen Score
66
66 / 100
Top 13% of 8,839 Patio, Lawn & Garden niches · +10 vs the category median of 56
Market size
$1.7M/yr237K searches / yr
90-day growth
+313.5%search demand this quarter
Competition
77%top-5 click share · 7 brands · 39 sellers

Flapen Score

Calcium Hardness Increaser against its category

The dotted line is the Patio, Lawn & Garden average. Past it, Calcium Hardness Increaser is stronger. Inside it, weaker.

66Pass
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The Calcium Hardness Increaser market on Amazon at a glance

Shoppers on Amazon United States searched for Calcium Hardness Increaser 237K times last year and spent an estimated $1.7M. The top 5 brands take 94% of clicks. Demand peaks in May–Jun–Jul. Flapen scores it 66 out of 100, a Pass.

01 · Demand

An estimated 22.7% of those searches ended in a purchase.

Shoppers searched for this 237K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 22.7% of those searches ended in a purchase. Searches in the last 90 days moved +313.5% against the 90 days before. Searches, conversion and average price together put the market at an estimated $1.7M a year.

Searches, last 12 months
237K
Growth, 90 days vs prior 90
+313.5%
Conversion, latest week
22.7%
Market size, estimated
$1.7Ma year
Peak month
June13.3× the quietest month
Top search term
calcium hardness increaser81K searches a year

02 · Price

A sale here is worth $31.15.

Listings sell for $31.15 on average, from $9.38 to $80.18. Amazon reports units sold in ranges. This niche sold 50K to 60K a year. The average listing sells 4,000 to 5,000 of them. At $31.15 that is $125K to $156K a year per listing.

Average price
$31.15inside the $15 to $100 sweet spot
Price range
$9.38–$80.18
Amazon United States median price
$24.38across 115,062 niches
Units sold a year
50K–60K
Units per listing a year
4,000–5,000
Revenue per listing a year
$125K–$156K
Returns
0.4%of orders · Amazon United States median 2.1%

03 · Entry bar

The bar here is ads and reviews.

100% of listings pay for placement with sponsored ads. 85% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #48 within Cleaning Tools & Chemicals. It carries 1,511 reviews at 4.70 stars, so a new listing needs social proof before a better product.

Sponsored listings
100%
Prime listings
85%
Out of stock, average day
0.0%
Average rank
#48in Cleaning Tools & Chemicals
Average rating
4.70 starsAmazon United States average 4.42 stars
Average reviews
1,511per listing
Listings tracked
13

04 · Newcomers

Brands here are established.

The brands on the shelf have sold for 79 months on average, so the names here are established.

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

Products

Top Calcium Hardness Increaser 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 24, 2026. The live listing can differ.

Competition

Competition: brands, sellers & click share

The top 5 products take an estimated 77% of clicks. A locked shelf that new listings rarely crack.

$0$168K$336K$504K$671K1001K10K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

7 falling

Sellers

39

Est. top-5 brand share

94%

Top 20: 100%

Est. top-5 click share

77%

Top 20: 100%

Open market

3%

  • CLOROX Pool&Spa29%
  • Pool Mate24%
  • In The Swim19%
  • HTH14%
  • Robelle7%
  • MAV AquaDoc4%
  • Open — no brand owns it (1 brand, 3%)

Demand

Calcium Hardness Increaser search demand

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

13K8KSpike '25Spike '26DecMarJunAugNovMarMay

Peak months: May, Jun, Jul · busiest ÷ quietest = 13.3×

Search terms

Top Calcium Hardness Increaser search terms shoppers use

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

  • calcium hardness increaser81K/yr
  • pool calcium hardness increaser25K/yr
  • calcium hardness increaser for swimming pools20K/yr
  • pool hardness increaser17K/yr
  • calcium chloride for pools13K/yr
  • pool calcium13K/yr
  • hardness increaser for swimming pools11K/yr
  • calcium for pool7K/yr
  • calcium increaser for pool7K/yr
  • hardness plus for swimming pools5K/yr

Reviews and returns

What reviews say buyers love and hate about Calcium Hardness Increaser

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

30%of positive reviews mention “Value For Money”
20%of negative reviews mention “Size-Overall”
0.4%of orders come back
“to large”
A buyer, on “Size-Overall”20% of negative 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.

19 topics

NegativePositive

FAQ

Common Calcium Hardness Increaser 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