N-Virol Algae & Lichen Killer 5L

N-Virol Algae & Lichen Killer is a high-performance concentrated biocide designed to effectively remove and prevent the growth of algae, moss, lichen, mould, and mildew on a wide range of hard surfaces. Suitable for both professional and domestic use, it delivers fast-acting results while being safe for most exterior materials.

This 5-litre concentrate is highly economical and dilutes with water to produce up to 100 litres of ready-to-use solution, covering approximately 250m² to 500m² depending on contamination levels. It is suitable for application on roofs, driveways, patios, paths, decking, tennis courts, gravestones, brickwork, concrete, stone, tarmac, and even artificial grass. It can be used indoors or outdoors, making it a versatile all-in-one surface treatment solution.

Formulated with Didecyldimethyl Ammonium Chloride, N-Virol works on contact to kill organic growth within 2–4 days, with continued cleaning action over the following weeks as dead matter naturally breaks down. It contains no acids or bleach, making it safer for surfaces while still delivering powerful cleaning performance. Once treated, surfaces become cleaner, safer, and less slippery, helping to prevent regrowth and maintain appearance over time.

For best results, apply in dry conditions above 5°C with no rain forecast for 24 hours. Apply using a knapsack sprayer, watering can, mop or brush, ensuring full coverage. Heavily contaminated areas may require pre-cleaning or a second treatment. Re-application may be needed in high-moisture or heavily shaded environments.

Features & Benefits

Fast-acting algae, moss & lichen removal (2–4 days)

Prevents regrowth for long-lasting surface protection

No bleach or acids – safe for most surfaces

Biodegradable formulation

High coverage: up to 500m² per 5L

Suitable for roofs, patios, paths, driveways & more

No scrubbing required after application

Indoor & outdoor use

Professional-grade results for domestic use

Improves surface safety by reducing slipperiness

Applications

Ideal for cleaning and maintaining:

Patios and paving slabs

Driveways and tarmac

Roof tiles and felt roofs

Brickwork and masonry

Stone walls and gravestones

Decking and fencing

Tennis courts and play areas

Artificial grass

Greenhouse glass and external tiles

Pack Size

5 Litres

Active Ingredient

Didecyldimethyl Ammonium Chloride

Coverage

250m² – 500m² (depending on growth level)

Dilution Rates:

Normal Growth: 50ml per 1L water (1:19)

Heavy Growth: 100ml per 1L water (1:9)

Severe Growth: 1:4 dilution

Product Type | Algae, Moss & Lichen Killer Concentrate

Pack Size | 5 Litres

Active Ingredient | Didecyldimethyl Ammonium Chloride

Coverage | 250m² – 500m² (depending on growth level)

Dilution Rates:

Normal Growth: 50ml per 1L water (1:19)

Heavy Growth: 100ml per 1L water (1:9)

Severe Growth: 1:4 dilution

Application Method | Knapsack sprayer, watering can, brush, mop, low-pressure sprayer

Use Areas | Roofs, patios, driveways, paths, decking, stone, brick, concrete, tarmac, tennis courts, gravestones, artificial grass

Use Type | Indoor & Outdoor

Weather Conditions | Apply above 5°C, dry conditions, no rain for 24 hours

Effect Time | Visible results in 2–4 days

Shelf Life | 2 years (sealed container conditions may vary)

Formulation | Water-soluble concentrate

Safety Approval | HSE Approved (Biocide Regulation compliant)