Consumer advocacy teardown
Slug & Snail Killer Pellets alternative & active ingredient dupe
Stop paying £7.49 for Doff. The bulk active is Ferric phosphate slug bait (~1% FePO4) — 36% less per working litre than a typical pack.
- Active
- Ferric phosphate
- CAS
- 10045-86-0
- Dupe
- Ferric phosphate slug bait (~1% FePO4)
- Saving
- 36% / L
Saving is per litre of working-strength mix versus a typical pack price, not versus the DIY kit total. Shop prices move — always check the listing.
The Marketing Claim & The Catch
A typical 800 g tub pack of Doff Slug & Snail Killer Pellets is about £7.49 in lawn & garden. That is a snapshot, not a live Amazon price — listings, sizes and deals move. The marketing line is that you are buying a finished lifestyle product, not a weighed chemical.
On the pack: Organic gardening approved; and Safe around edible crops up to harvest.
The catch: Metaldehyde is gone. What remains is ~1% ferric phosphate in a cereal pellet. The 800 g tub is a small bag of the same bait sold in 2–5 kg buckets to allotmenteers. You are paying for the child-resistant lid.
- “Organic gardening approved”
- “Safe around edible crops up to harvest”
Proprietary Blend & Dosage Breakdown
The labelled active is Ferric phosphate at 1%. Everything else in the pack is wheat bait and binders.
At 1% active, most of what you pay for is carrier and packaging. The brand is selling convenience, fragrance and a label — not a uniquely potent molecule.
Branded working strength is whatever comes out of the bottle. The bulk alternative is 1% Ferric phosphate slug bait (~1% FePO4), mixed to 5 g/m² scatter.
- Labelled active
- Ferric phosphate
- 1%
- Carrier
- Wheat bait and binders
- Retail pack
- 800 g tub · £7.49
The Active Chemical Alternative (Dupe Stack)
The dupe stack is Ferric phosphate slug bait (~1% FePO4) at 1% bulk. Indexed as CAS 10045-86-0, formula FePO4. Buy it as 2.5 kg for about £14.99 from Amazon UK.
Working strength: 5 g/m² scatter. Indicative cost £0.03 per diluted litre — 36% below a typical branded pack on a per-litre basis, before you reuse leftover bulk.
Follow the mixing method and the supplier SDS. Wear the listed PPE. Do not mix incompatible oxidisers, acids or ammonia.
- Scatter 5 g/m² around vulnerable plants, not in heaps. Keep pellets dry in the tub.
- 2.5 kg at 5 g/m² covers about 500 m² — more than an 800 g tub (about 160 m² at the same rate).
- Ferric phosphate is still a pesticide: follow the label on the bag you buy. Not metaldehyde. Keep away from pets that eat bait.
Mixing desk
Dilution calculator
Switch between filling a sprayer and covering a measured surface. Figures are educational estimates from the listed ratio — always check the SDS.
Formula
Ferric phosphate slug bait (~1% FePO4)
- Concentrate
- 100 g
- grams of solid
- Water
- 1 L
- carrier volume
- Batch cost
- £0.60
- 1 L working solution
- Saved vs retail
- £0.34
- 36% · retail £0.94
Estimated coverage at the listed rate: 20 m².
Side-by-Side Price & Potency Comparison
Head-to-head comparison
| Measure | Retail brandedDoff | Raw active dupeDupeStack |
|---|---|---|
| Product | Slug & Snail Killer PelletsAmazon UK search — listing, not a confirmed seller | Ferric phosphate slug bait (~1% FePO4) |
| Pack / unit | 800 g tub · £7.49 | 2.5 kg · £14.99 |
| Active | Ferric phosphate at 1%Carrier: Wheat bait and binders | 1% bulkFePO4 |
| CAS number | Not disclosed on pack | 10045-86-0 |
| Working strength | Ready-to-use pack | Dilute 5 g/m² scatter |
| Cost per litre | £7.49 / pack | £0.03 / L mixed from bulk |
| Headline saving | Baseline | 36% cheaper |
| COSHH / PPE | Follow the branded SDS | Gloves. Chemical-resistant gloves (nitrile or neoprene) |
Active ingredient and cheaper alternative — FAQ
What is the active ingredient in Doff?
Doff Slug & Snail Killer Pellets is labelled as Ferric phosphate at 1%. The carrier is Wheat bait and binders. Pack size: 800 g tub. The bulk equivalent we index is Ferric phosphate slug bait (~1% FePO4) (CAS 10045-86-0).
Is Ferric phosphate slug bait (~1% FePO4) safe on lawns?
Used at the listed working strength (5 g/m² scatter), the dupe is the same chemistry as the branded pack for lawns, beds and pots. That is not a blanket all-clear: read the supplier SDS, wear the listed PPE, keep acids away from hypochlorite, and follow UK HSE/COSHH rules. Wellness teardowns are supplements, not medicines.
Is there a cheaper alternative to Doff Slug & Snail Killer Pellets?
Yes. The bulk equivalent is Ferric phosphate slug bait (~1% FePO4) (CAS 10045-86-0). Indicative saving 36% per working litre versus a typical £7.49 pack. Working strength: 5 g/m² scatter. Live shop prices move.
How do you mix the Slug & Snail Killer Pellets dupe stack?
Scatter 5 g/m² around vulnerable plants, not in heaps. Keep pellets dry in the tub. 2.5 kg at 5 g/m² covers about 500 m² — more than an 800 g tub (about 160 m² at the same rate). Ferric phosphate is still a pesticide: follow the label on the bag you buy. Not metaldehyde. Keep away from pets that eat bait.
DupeStack provides chemical concentration data and educational mixing guides. Always review official manufacturer Safety Data Sheets (SDS) and comply with UK Health and Safety Executive (HSE) and COSHH regulations when handling concentrated substances. Some links on this site are affiliate links.
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DIY stack · 36% / L vs branded
£22.50indicative kit · Amazon cannot add a mixed search kit as one basket