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calcium water filter
Skip itSoft demand (-6.6% this quarter) — this niche doesn't clear our bar today.
Avg price
Great$57.87avg listing price — sweet spot $15–$100
Returns
Great1.7%return rate — above 5% kills the launch gate
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Conversion
Okay3.9%search→purchase rate — share of searches ending in a sale
Competition
Okay61%top-5 click share — leaders hold, buyers still browse
Brand share
Okay88%top-5 brand share — brands hold most of the demand
Market size
Okay$117K$117K/yr · 52K searches
Review moat
Bad6,255.59avg incumbent reviews — the moat a new listing must climb
Price range
Bad$12.60–$372.37cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Bad-6.6%90-day search growth — must beat 0% to launch
Signals High Price