45
filtrete f2 air purifier replacement filter
Skip itA concentrated shelf (top 5 take 100% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible19.1%search→purchase rate — share of searches ending in a sale
Returns
Incredible0.6%return rate — above 5% kills the launch gate
Avg price
Incredible$32.47avg listing price — sweet spot $15–$100
Price range
Incredible$24.66–$45.28cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Great464.4avg incumbent reviews — the moat a new listing must climb
Growth
Okay+19.7%90-day search growth — must beat 0% to launch
Market size
Bad$99K$99K/yr · 16K searches
Quality gap
Bad4.8★avg incumbent rating — lower means beatable quality
Competition
Bad100%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
Signals Low Review Barrier