Is ph decreaser for hot tub profitable to sell on Amazon United States?

The niche generates $1.2M/yr across 16 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is +15.8%. Flapen's verdict: Launch it (60/100).

How competitive is the ph decreaser for hot tub niche?

8 brands and 81 sellers compete. The top 5 products take 62% of clicks and top 5 brands hold 87% of demand.

What do buyers complain about in ph decreaser for hot tub?

Top complaints mined from reviews: Functionality-Overall, Value For Money, Size-Overall. The return rate is 0.4%.

When does demand for ph decreaser for hot tub peak?

Demand peaks in May; the busiest month runs 2.1× the quietest.

What does it cost to enter the ph decreaser for hot tub niche?

Listings span $8.17–$39.84; the average listing price is $18.95 (sweet spot $15–$100). The average incumbent carries 2,167 reviews — the moat a new listing must climb.

ph decreaser for hot tub

Launch it

A $1.2M/yr market growing +15.8% this quarter with returns at 0.4% — clears our launch bar.

Conversion

Incredible34.0%

search→purchase rate — share of searches ending in a sale

Returns

Incredible0.4%

return rate — above 5% kills the launch gate

Avg price

Great$18.95

avg listing price — sweet spot $15–$100

Market size

Great$1.2M

$1.2M/yr · 184K searches

Price range

Great$8.17–$39.84

cheapest to priciest tracked listing — scored on the share inside $15–$100

Growth

Okay+15.8%

90-day search growth — must beat 0% to launch

Review moat

Okay2,166.88

avg incumbent reviews — the moat a new listing must climb

Competition

Okay62%

top-5 click share — leaders hold, buyers still browse

Brand share

Okay87%

top-5 brand share — brands hold most of the demand

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

According to Flapen's Amazon United States niche tracking, ph decreaser for hot tub is a $1.2M/yr Amazon United States market (184K searches/yr). The top 5 brands hold 87% of demand. Demand peaks in May. Verdict: Launch it — 60/100.

Data updated Jul 24, 2026 · scored weekly · How we score niches

ph decreaser for hot tub market data

Units sold / yr: 50K–60K; avg 3,000–4,000/product
Revenue / yr: $948K–$1.1M; units × avg price
Conversion rate: 34.0%
Avg BSR: #68
Page quality: 0%
Prime: 94%
Sponsored: 100%
Out of stock: 0.0%
Avg brand age: 88 months
Avg seller age: 149 days

Competition & brand share

The top 5 products take 62% of clicks — established leaders, but buyers still shop beyond them.

Brands

8 flat

Sellers

Top-5 brand share

87%

Top 20: 100%

Top-5 click share

62%

Top 20: 100%

Open market

CLOROX Pool&Spa27%
SpaGuard23%
LEISURE TIME16%
MAV AquaDoc12%
FROG9%
hth Spa7%
Open — no brand owns it (2 brands, 6%)

Demand & seasonality

Weekly Amazon search volume, last 103 weeks — +15.8% search growth over the last 90 days.

Peak months: May · busiest ÷ quietest = 2.1×

Open Trend

Top ph decreaser for hot tub search terms

ph decreaser for hot tub43K/yr +21.3%23.5% conv.
ph down hot tub36K/yr +10.3%23.1% conv.
spa down13K/yr +22.7%22.7% conv.
spa down for hot tub14K/yr +1.4%23.6% conv.
hot tub ph decreaser11K/yr +15.8%24.0% conv.
leisure time spa down7K/yr +40.9%22.7% conv.
spa ph down7K/yr +49.8%25.8% conv.
spaguard ph decreaser9K/yr +1.3%19.0% conv.
spa guard ph decreaser for hot tub8K/yr -8.5%18.2% conv.
spa ph decreaser9K/yr -0.6%22.6% conv.

All search terms

Top ph decreaser for hot tub 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 16 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Clorox Pool&Spa Spa pH Down Lowers pH in Spa Water Safe for All Spa Types 22 ounce (Pack of 1)

CLOROX Pool&Spa$9.084.7★1,964 rev

SpaGuard pH Decreaser 22 oz Single Pack

SpaGuard$10.184.7★3,754 rev

Leisure Time 22338 Spa Down pH Reducer for Hot Tubs and Spas Prevents Scaling and Clouding Compatible with Various Sanitizers 2.5lbs

LEISURE TIME$11.694.7★4,594 rev

FROG DropH pH and Total Alkalinity Decreaser for Hot Tubs and Swim Spas - 3 lb Bottle with TruDose Measuring Cap for Easy Maintenance & Balancing - 1 Pack

FROG$16.074.7★176 rev

AquaDoc Spa pH Decreaser for Hot Tub - 32oz - Sodium Bisulfate Spa pH Down for Water Balance - Made in USA

MAV AquaDoc$24.774.5★440 rev

Newest

by launch date

AquaDoc Spa pH Decreaser for Hot Tub - 32oz (2-Pack) - Sodium Bisulfate Spa pH Down for Water Balance - Made in USA

MAV AquaDoc$35.2764 rev

8mo ago

FROG DropH pH and Total Alkalinity Decreaser for Hot Tubs and Swim Spas - 3 lb Bottle with TruDose Measuring Cap for Easy Maintenance & Balancing - 1 Pack

FROG$16.07176 rev

11mo ago

AquaDoc Spa pH Decreaser for Hot Tub - 64oz - Sodium Bisulfate Spa pH Down for Water Balance - Made in USA

MAV AquaDoc$33.9382 rev

1y ago

Leisure Time 22338-02-A Spa Down 2.5-Pounds 2-Pack

LEISURE TIME$24.1846 rev

2y ago

SpaGuard Rapid-Dissolve pH Decreaser Tabs for Spas & Swim Spas 1.25 lb Quickly Decrease Water pH Level Protects Spa Equipment

SpaGuard$18.3343 rev

2y ago

What buyers say about ph decreaser for hot tub

What buyers praise and complain about, mined from review topics.

What buyers love

Value For Money22%

“Great value”

Ease Of Use19%

“Easy to use”

Advertised Vs Actual Product17%

“As advertised”

Quality-Overall16%

“maintains consistent quality”

Pureness4%

“helps keep the water clear”

Instructions/User Manual/Troubleshooting3%

“Clear labeling and instructions”

Strength2%

“Effective”

Smell2%

“There is no odor”

Measurement/Reading Accuracy1%

“Tested with a ph meter shows it is effective”

Ease Of Cleaning1%

“Water is/stays much cleaner”

What buyers complain about

Functionality-Overall33%

“Did not work”

Value For Money30%

“Terrible Value”

Size-Overall10%

“it was much smaller than what I have received in the past by same brand”

Shape/Style5%

“the shape is weird”

Contamination5%

“it was drain”

Hard Feel3%

“Our water is extremely hard”

Quality-Overall3%

“it performs worse than cheaper brands”

Leak-Proof1%

“Heavy liquid containers can sometimes arrive damaged or leaking”

Top return reasons

Leak-Proof31%

Advertised Vs Actual Product22%

Functionality-Overall14%

Value For Money14%

Size-Overall3%

Contamination2%

Product Condition2%

Defective Material/Parts1%