---
title: "Calcium Hypochlorite — $1.2M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/calcium-hypochlorite"
last_updated: "2026-08-06T21:17:00.680Z"
locale: en
meta:
description: "Niche score 67/100 · $1.2M/yr market · 223K searches/yr · $83.15 avg price. Clears our launch bar. Data updated Jul 2026."
"og:description": "Niche score 67/100 · $1.2M/yr market · 223K searches/yr · $83.15 avg price. Clears our launch bar. Data updated Jul 2026."
"og:title": "Calcium Hypochlorite — $1.2M/yr Amazon US Niche (2026) - Flapen"
---
# **calcium hypochlorite**
**Launch it**
A $1.2M/yr market growing +96.4% this quarter with returns at 0.1% — clears our launch bar.
Market size 82Growth 90Conversion 72Competition 69Returns 100Price range 32Avg price 81Brand share 37Review moat 24Quality gap 30
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Growth**
**Great****+96.4%**
90-day search growth — must beat 0% to launch
**Market size**
**Great****$1.2M**
$1.2M/yr · 223K searches
**Avg price**
**Great****$83.15**
avg listing price — sweet spot $15–$100
**Conversion**
**Good****6.6%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Good****43%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****83%**
top-5 brand share — brands hold most of the demand
**Price range**
**Okay****$4.45–$269.29**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****5,626.46**
avg incumbent reviews — the moat a new listing must climb
**Signals**[** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, calcium hypochlorite is a $1.2M/yr Amazon United States market (223K searches/yr). The top 5 brands hold 83% of demand. Demand peaks in Jun–Sep. Verdict: Launch it — 67/100.
Data updated Jul 24, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **calcium hypochlorite market data**
- **Units sold / yr**
- **13K–15K**
- avg 250–500/product
- **Revenue / yr**
- **$1.0M–$1.2M**
- units × avg price
- **Conversion rate**
- **6.6%**
- **Avg BSR**
- **#99**
- **Page quality**
- **0%**
- **Prime**
- **43%**
- **Sponsored**
- **89%**
- **Out of stock**
- **10.7%**
- **Avg brand age**
- **75 months**
- **Avg seller age**
- **141 days**
## **Competition & brand share**
The top 5 products take 43% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**12 **▼falling
**Sellers**
**90**
**Top-5 brand share**
**83%**
Top 20: 100%
**Top-5 click share**
**43%**
Top 20: 90%
**Open market**
**12%**
- In The Swim38% - HTH20% - Leslie's10% - CLOROX Pool&Spa7% - DryTec7% - Pyrock Chemical5% - Open — no brand owns it (6 brands, 12%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +96.4% search growth over the last 90 days.
70K50KSpike '24Spike '25Black Friday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jun, Sep · busiest ÷ quietest = 26.1×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/calcium-hypochlorite/trend)
## **Top calcium hypochlorite search terms**
- **calcium hypochlorite**71K/yr+19.6%4.0% conv. - **cal hypo pool shock**33K/yr+288.1%6.4% conv. - **calcium hypochlorite pool shock**30K/yr+149.6%5.0% conv. - **leslies pool shock**12K/yr+206.1%4.6% conv. - **in the swim pool shock**12K/yr+221.9%13.2% conv. - **cal hypo**10K/yr+250.1%5.2% conv. - **cal hypo shock**6K/yr+249.9%5.5% conv. - **pool shock bulk**4K/yr+175.1%4.8% conv. - **cal-hypo pool shock**4K/yr+278.3%6.4% conv. - **pool shock calcium hypochlorite**7K/yr-51.9%4.2% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/calcium-hypochlorite/search-terms)
## **Top calcium hypochlorite 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%5%$61K10%$123K15%$184K20%$246K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**In The Swim Pool Shock 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water Defends Against Bacteria Algae and Microorganisms - 12 X 1 Pound**In The Swim**$51.23**4.6★16,150 rev](https://www.amazon.com/dp/B002WKQ3IE) [2**HTH 52037R Pool Care Shock Advanced Swimming Pool Chemical - Cal Hypo Formula Prevents Bacteria & Algae Restores Crystal Clear Water - Shock Treatment 1lb (12 Pack)**HTH**$48.09**4.7★14,239 rev](https://www.amazon.com/dp/B09R82X1S5) [3**In The Swim Pool Shock 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water Defends Against Bacteria Algae and Microorganisms - 24 X 1 Pound**In The Swim**$100.11**4.6★16,150 rev](https://www.amazon.com/dp/B003BPNHV0) [4**In The Swim Pool Shock 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water Defends Against Bacteria Algae and Microorganisms - 25 Pounds**In The Swim**$110.81**4.6★16,150 rev](https://www.amazon.com/dp/B002WKJ6IS) [5**HTH 52036R Pool Care Shock Advanced Swimming Pool Chemical - Cal Hypo Formula Prevents Bacteria & Algae Restores Crystal Clear Water - Shock Treatment (6 Pack)**HTH**$26.01**4.7★14,239 rev](https://www.amazon.com/dp/B09R839DJ1)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Leslies Leslies Power Powder Plus 73% Cal-Hypo Granular Pool Shock Sanitizer for Crystal Clear Water Fast-Dissolving Eliminates Algae & Bacteria 6 x 1 Pound Bags 25273**Leslie's**$49.21**77 rev6mo ago](https://www.amazon.com/dp/B0GFFYW7BD) [**AquaTick 68% Calcium Hypochlorite Pool Shock for Swimming Pools Chlorine Granules 25 lbs Bucket Pool Chlorine for Inground and Above Ground Pool Treatment Non-Stabilized Shock Treatment**Aquatick**$88.84**37 rev8mo ago](https://www.amazon.com/dp/B0G1J48G8H) [**Leslies Leslies Power Powder Plus Cal-Hypo Granular Pool Shock Sanitizer for Crystal Clear Water Fast-Dissolving Eliminates Algae & Bacteria 25 Pounds W8000326**Leslie's**$162.60**10 rev1y ago](https://www.amazon.com/dp/B0FFNDB7XZ) [**POOL SHARK 68% Calcium Hypochlorite Pool Shock | 25 lb Bucket Chlorine Granules | Pool Shock Treatment for Swimming Pools | Inground & Above Ground Pool Cleaning Fast-Acting Chlorine Shock**POOL SHARK**$93.96**45 rev1y ago](https://www.amazon.com/dp/B0DJ3K4CF9) [**Clorox Pool&Spa Shock Clear for Crystal Clear Swimming Pool Water Swim-ready in 15 minutes Suitable for vinyl pools (12-Pack)**CLOROX Pool&Spa**$50.81**1,860 rev2y ago](https://www.amazon.com/dp/B0CY2VPGDB)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**HTH 52046 Pool Care Shock Advanced Swimming Pool Chemical - Cal Hypo Formula Prevents Bacteria & Algae Restores Crystal Clear Water - Shock Treatment 1lb (15 Pack) + 15 HTH Pool Care Test Strips**HTH**$59.42**4.7★**▲ 105%**](https://www.amazon.com/dp/B0B5JZ3XFV) [**Clorox Pool&Spa Shock Clear for Crystal Clear Swimming Pool Water Swim-ready in 15 minutes Suitable for vinyl pools (12-Pack)**CLOROX Pool&Spa**$50.81**4.7★**▲ 87%**](https://www.amazon.com/dp/B0CY2VPGDB) [**Leslies Leslies Power Powder Plus 73% Cal-Hypo Granular Pool Shock Sanitizer for Crystal Clear Water Fast-Dissolving Eliminates Algae & Bacteria 6 x 1 Pound Bags 25273**Leslie's**$49.21**4.5★**▲ 72%**](https://www.amazon.com/dp/B0GFFYW7BD) [**POOL SHARK 68% Calcium Hypochlorite Pool Shock | 25 lb Bucket Chlorine Granules | Pool Shock Treatment for Swimming Pools | Inground & Above Ground Pool Cleaning Fast-Acting Chlorine Shock**POOL SHARK**$93.96**4.6★**▲ 68%**](https://www.amazon.com/dp/B0DJ3K4CF9) [**HTH 52030B Swimming Pool Care Shock Swimming Pool Chlorinator Boosts Chlorine Levels Cal Hypo Formula 13.3oz (Pack of 6)**HTH**$24.01**4.8★**▲ 66%**](https://www.amazon.com/dp/B09R82PPNS)
**~~View all trending →~~**
## **What buyers say about calcium hypochlorite**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Value For Money**35%
*“Excellent value”*
**Quality-Overall**21%
*“quality is consistent as is the product”*
**Advertised Vs Actual Product**13%
*“As described”*
**Ease Of Use**7%
*“Easy to use”*
**Ease Of Cleaning**5%
*“Cleans pool well”*
**Water Resistance**4%
*“keeps the pool water maintained clear”*
**Durability**3%
*“It seems durable”*
**Filtration**2%
*“Clear pool”*
**Pureness**1%
*“Crystal Clear Pool”*
**Strength**1%
*“Full strength”*
### **What buyers complain about **
**Value For Money**20%
*“Far to expensive”*
**Functionality-Overall**17%
*“DID NOT WORK”*
**Quality-Overall**13%
*“Poor quality control”*
**Moist/Dry**5%
*“Opened the sealed container and had some type of moisture because it was clumpy and still wet”*
**Smell**5%
*“I noticed the shock it has no chemical smell”*
**Filtration**5%
*“causes filter build up”*
**Color**3%
*“not the pure white that it should be”*
**Leak-Proof**3%
*“it had leaked out in transit”*
**Instructions/User Manual/Troubleshooting**3%
*“Useless Dosage Instructions - Outrageous”*
**Water Resistance**3%
*“Doesn't clear water”*
### **Top return reasons **
**Value For Money**26%
**Advertised Vs Actual Product**19%
**Size-Overall**13%
**Functionality-Overall**13%
**Leak-Proof**7%
**Defective Material/Parts**3%
**Ease Of Use**2%
**Contamination**2%
**Filtration**2%
**Instructions/User Manual/Troubleshooting**2%
## **Common questions**
- **Is calcium hypochlorite profitable to sell on Amazon United States?**
- The niche generates $1.2M/yr across 28 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is +96.4%. Flapen's verdict: Launch it (67/100).
- **How competitive is the calcium hypochlorite niche?**
- 12 brands and 90 sellers compete. The top 5 products take 43% of clicks and top 5 brands hold 83% of demand.
- **What do buyers complain about in calcium hypochlorite?**
- Top complaints mined from reviews: Value For Money, Functionality-Overall, Quality-Overall. The return rate is 0.1%.
- **When does demand for calcium hypochlorite peak?**
- Demand peaks in Jun–Sep; the busiest month runs 26.1× the quietest.
- **What does it cost to enter the calcium hypochlorite niche?**
- Listings span $4.45–$269.29; the average listing price is $83.15 (sweet spot $15–$100). The average incumbent carries 5,626 reviews — the moat a new listing must climb.
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