40
best water filter
Skip itA small market ($51K/yr) — this niche doesn't clear our bar today.
Avg price
Great$100.52avg listing price — sweet spot $15–$100
Competition
Good41%top-5 click share — leaders hold, buyers still browse
Brand share
Good66%top-5 brand share — brands hold most of the demand
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Returns
Good2.9%return rate — above 5% kills the launch gate
Growth
Bad-6.3%90-day search growth — must beat 0% to launch
Price range
Bad$13.86–$422.62cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Bad14,670.46avg incumbent reviews — the moat a new listing must climb
Conversion
Bad1.2%search→purchase rate — share of searches ending in a sale
Market size
Bad$51K$51K/yr · 42K searches
Signals High Price