---
title: "Trend — fish tank filter cartridges - Flapen"
canonical_url: "https://flapen.com/research/uk/pet-supplies/fish-tank-filter-cartridges/trend"
last_updated: "2026-07-31T10:59:09.171Z"
locale: en
meta:
  description: "Niche score 52/100 · £75K/yr market · 61K searches/yr · £10.91 avg price. Soft demand (-27.2% this quarter) keeps it on the watch list. Data updated Jul 2026."
  "og:description": "Niche score 52/100 · £75K/yr market · 61K searches/yr · £10.91 avg price. Soft demand (-27.2% this quarter) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Trend — fish tank filter cartridges - Flapen"
---

# **fish tank filter cartridges**

**Worth a look**

Shows low returns (0.8%), but soft demand (-27.2% this quarter) keeps it on the watch list.

Market size 19Growth 11Conversion 92Competition 66Returns 96Price range 53Avg price 41Brand share 34Review moat 66Quality gap 73

**Returns**

**Incredible****0.8%**

return rate — above 5% kills the launch gate

**Conversion**

**Great****11.1%**

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

**Quality gap**

**Good****4.3★**

avg incumbent rating — lower means beatable quality

**Competition**

**Good****45%**

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

**Review moat**

**Good****840.54**

avg incumbent reviews — the moat a new listing must climb

**Price range**

**Good****£2.73–£28.59**

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

**Avg price**

**Okay****£10.91**

avg listing price — sweet spot $15–$100

**Brand share**

**Okay****84%**

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

**Market size**

**Bad****£75K**

£75K/yr · 61K searches

**Growth**

**Bad****-27.2%**

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