DDAC 50% Biocide FAQs
Answers to the questions we get asked most about ordering, using and stocking AK Exterior Biocide DDAC 50%. Anything not covered here, just call 07920 553137.
Frequently Asked Questions
Ordering and delivery
How do I place an order?
Fill in the order form with the sizes you want and whether you are collecting or want it delivered, or just call or WhatsApp us on 07920 553137. We come back to you to confirm stock, the delivery cost and how to pay before anything is sent.
Can I collect my order?
Yes. Every size can be collected from Kettering. Once your order is in, we will be in touch to confirm availability and agree a collection time.
Do you deliver?
Yes, anywhere in Great Britain. Delivery is not included in the listed prices; we confirm the cost for your postcode when we confirm your order. See delivery and returns.
What happens after I send the form?
We contact you directly to go through your order, confirm availability and arrange collection or delivery. Nothing is sent until you have agreed the total.
How much does delivery cost?
It depends on your postcode and the size of the order. We confirm the exact cost when we confirm your order, before you pay.
Using the product
Do I need training to use it?
Yes. As with every professional-use biocide, it is the user's responsibility to have the training, knowledge and competence to use it safely and correctly. Read the label and the safety data sheet before you use it.
What dilution should I use?
As an industry guideline: 1 part biocide to 25 parts water on render and on roof tiles and slates after scraping, and 1 part to 50 parts water on ground-level hard surfaces. Adjust for the surface and conditions, and always stay within the product label. Full detail on the how to use page.
How long before I see results?
The biocide kills the growth quickly, but the dead matter is cleared by rain and weathering over time, so the surface cleans up gradually. Results are typically visible within 4 to 8 weeks. Do not rinse it off.
Why choose a 50% biocide over a 10% one?
You dilute it further, so each drum makes around four to five times as much mixed solution as a 10% product. That means fewer drums to buy, carry and store, and a lower cost per square metre.
Can I use it on roofs without pressure washing?
Yes, that is the point of it. Scrape off heavy moss, then apply the biocide at low pressure and let it weather clean. Pressure washing roof tiles and render can strip coatings and force water under tiles.
Does it work on non-porous surfaces?
It still kills the growth on contact, but smooth, non-porous surfaces hold less of the residual, so the long-term protection is shorter than on porous surfaces like render and old tiles.
How much will I need for my job?
Use the coverage calculator. As a rough guide, 5 litres at 1:25 covers about 520 m² of roof or render, and at 1:50 about 1,020 m² of ground-level surface.
Safety and regulations
Who can buy this product?
It is supplied for professional use only, for trained exterior cleaning contractors. Buyers must be 18 or over, and we only sell to addresses in Great Britain.
Where do I find the safety data sheet?
On the safety data sheet page, along with the HSE approval number and product identity.
Is it approved?
Yes. It carries HSE approval number 11113-GB and PST number 4336 / 11119 for professional use.
Trade and wholesale
Can I stock it in my shop?
Yes, as long as you sell it to professional users. Send a trade enquiry with your business type and expected volume.
Still got a question? Ask us directly.