BAC50 Powerwash Biocide – Benzalkonium Chloride Outdoor Cleaner for Algae, Mould & Lichen – HSE Approved
Eliminate Algae, Mould & Lichen — Professional-Grade Results
BAC50 is a 50% benzalkonium chloride biocide trusted by professional cleaners and soft wash operators across the UK. Dilute it, apply it, and let it work — treated surfaces self-clean over time as biological growth breaks down and washes away naturally.
- ✅ HSE Approved — HSE No. 11166-002-GB
- ✅ Fast-acting — kills algae, mould, and lichen on contact
- ✅ Self-cleaning action — surfaces continue to clear after application
- ✅ Highly concentrated — 50% benzalkonium chloride, dilutes up to 1:30
- ✅ Covers up to 4m² per litre of diluted solution
- ✅ Suitable for roofs, render, cladding, patios, and exterior hard surfaces
For professional use only. Need more than 200 litres? Contact us at orders@liquipak-shoponline.co.uk or call 01484 44 22 33.
Recommended Dilutions
- Render & Roof Slates/Tiles: 1:20 (1 part BAC50 to 20 parts water)
- Hard Ground Surfaces (patios, driveways): 1:30 (1 part BAC50 to 30 parts water)
- Application rate: 1 litre of diluted solution per 4m² (250ml/m²)
How to Use
- Dilute with clean water to the appropriate ratio before application.
- Apply evenly using a low-pressure sprayer or soft brush.
- Leave the product to work — allow the surface to weather and self-clean naturally.
- Where areas are regularly accessed by animals or children: apply, allow at least 1 hour contact time, then rinse thoroughly.
Performance depends on surface porosity, shade, temperature, organic load, and environmental conditions.
Safety & Aftercare
- For use as a surface biocide only. Read all precautions before use.
- COSHH Regulations 2002 (as amended) apply to use of this product at work.
- Users must comply with all legal responsibilities under the Control of Pesticides Regulations 1986 (as amended).
- It is the responsibility of the end user to ensure they have appropriate training, competence, and PPE required to use professional-grade biocides safely.
- Avoid excessive contamination of coveralls. Do not contaminate foodstuffs or food contact surfaces.
- Keep away from treated surfaces until dry.
- Avoid contact with ponds, waterways, and vegetation.
- Do not mix with other chemicals.
- Wash hands and exposed skin before meals and after use.
- Dispose of material and container in a safe way.
Buy It With
Quick BuyI used BAC50 on the roof of my house with a mixture ratio of approximately 1 part BAC50 to 8 parts water. As you can clearly see from the photo, it's quite obvious as to which side has been treated! It's an excellent product and so easy to use. Highly recommended.
What a fantastic product. Just one spray at 8:1 mix, look at the difference.
I always use Liquipak Bac 50 after Roof Cleaning as an after treatment.
Easy to mix and apply, foams up very well and leaves a great result.
Have been using there biocide for 2 years now, revisiting roofs we've cleaned and seeing the biocide working hard makes you feel you've made a good choice.
BAC50 Powerwash Biocide – Benzalkonium Chloride Outdoor Cleaner for Algae, Mould & Lichen – HSE Approved
Great product quick delivery
Good quality chemical ,will be buying again
Excellent product and very quick delivery
Great products
Great price, simple ordering process, prompt despatch, quick delivery.
What's not to like? It's generic BAC 50 so will do the job at the right dilution.
Would recommend anyone to pick these guys as a supplier. Faultless.
Very quick delivery. With this company And free great products.
Good customer service and quick delivery. Very pleased with the product.
Great service. Quick delivery.
Excellent product. Really does work. Received it very quickly. Would buy again from this company.
Very good
Really good product and as long as instructions are followed works extremely well!.
not yet used the product,it was delivered super fast and it was very well packaged.i can't wait for some dry weather so i can use this...
Just as described, looking good
A reliable product from a reliable supplier at a competitive price, what more can you ask?
Goods came well packaged & fast delivery. What more do you want?
Can’t fault it. Quality stuff.
When we ordered this BAC 50 we expected it would take at least 3 to 5 days given the nature of the liquid but it arrived next day and worked a treat, if using it to remove moss from paths make sure the area is dry we did use it when ground was damp it worked, but tried it again on another area when that was dry it worked very quickly by next morning moss was dead.
Not only is the product its self great but the speed and easy service i received makes me come back for more!
Professionally run operation.
Item as described delivered in suitable packaging the next day as advertised.
I have used Wet and Forget before and it is fairly good. A gardener friend recommended BAC 50. I used it everywhere - wood, patio, tiles and stone pathways etc. incredible. Not a green patch of lichen or algae left. The whole place gleaming. Fantastic
Excellent service
Was recommended by my son who had ordered some.
Cleaned all the green mould off my decking.
Highly recommend it. Thank you.
Stuff works well - death to litchen :-)
Frequently Asked Questions
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Liquipak Patio Cleaner is a specialised product for driveway and patio cleaning. However, for stubborn and hard-to-remove stains, we advise Sodium Hypochlorite. Its formula is created to remove even the most difficult marks.If you have black spots, check out our Black Spot Remover Concentrate.
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Sodium Hypochlorite is used for more stubborn stains. The recommended dilution ratio is 5:1 however, the dilution ratio can be increased if needed.
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The shelf life of Sodium Hypochlorite is 24 months from purchase, however due to the nature of the product, it will slowly start to lose strength after 3 months.
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Yes, Sodium Hypochlorite is generally safe to use on Indian Sandstone, however the product must be diluted and tested on a small area first to check for adverse reactions.
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50%.
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Liquipak’s Black Fluid is similar in function to Jeyes Fluid. Our Black Fluid has a strong and distinct fragrance that will remain after the product is washed away and will fade away over time.
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We have formulated four vegan and cruelty free washing up liquids. You can find them here. We are working on expanding the vegan line.
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Yes, we wanted a fragrance-free soap suitable for sensitive skin. If you’re looking for a soap with perfume, please check out our Pink Hand Soap.
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Unfortunately, we do not deliver overseas, to Ireland and Northern Ireland.
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Yes, you can cancel your order if it has not been dispatched.
If you need any information or help please contact info@liquipak-shoponline.co.uk
