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universal water filter cartridge
Skip itA small market ($40K/yr) — this niche doesn't clear our bar today.
Returns
Great1.4%return rate — above 5% kills the launch gate
Conversion
Great8.6%search→purchase rate — share of searches ending in a sale
Avg price
Good£14.46avg listing price — sweet spot $15–$100
Price range
Good£7.92–£25.78cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Good72%top-5 brand share — brands hold most of the demand
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Competition
Okay66%top-5 click share — leaders hold, buyers still browse
Review moat
Bad5,680.26avg incumbent reviews — the moat a new listing must climb
Growth
Bad-5.8%90-day search growth — must beat 0% to launch
Market size
Bad£40K£40K/yr · 33K searches
Signals Low Review Barrier