The unit of measurement is a dot, not a tube
One application point is a pea-sized dot of roughly 0.25 g, placed every 30 cm along a travel route. A 20 ml tube gives you about 70 dots; a 60 ml tube gives you about 200. Thinking in dots is what stops people under-treating a kitchen with a single line of gel along a skirting board.
- Kitchen: 20 to 30 dots per round
- Bathroom or utility room: 8 to 12 dots
- Single room spot treatment: 5 to 8 dots
- Commercial kitchen: 60 to 100 dots per round
Match the kit to the job
For one room with a defined trail, the Targeted Spot Treatment Kit is enough. For a kitchen and bathroom together — the normal domestic cockroach picture — the Whole-Home Kit covers the full round plus the day 3 top-up. For multi-room premises, flats you manage or a long-established infestation, the Commercial pack is sized for a whole site.
Allow for the day 3 top-up
Bait that is eaten has done its job and must be replaced. Budget roughly 40% of your first round again for the re-inspection on day 3, and more where dots disappear completely within a day — heavy consumption means a large population, not a wasted tube.
Everything below assumes a professional-strength bait — our cockroach gel bait kits kits ship with the applicator and placement map referenced here.
Heavy infestations
With daylight sightings, droppings in several rooms or activity in shared ducts, double the dot count and plan two to three top-up rounds over the first fortnight. Under-baiting is the single most common reason a treatment stalls at 'better but not gone'.