Categories: Algae Remover, All Products, All Products, Brick, Concrete and Grout Cleaner, Cleaning Chemicals, Driveway Cleaner, Gk Products, Paths and Patio Cleaner, Render Cleaner

Tags: algo clear, algoclear, GKPro5Ltr, Professional Grade, Professional Use Only, Trade Only

GK Pro 5Ltr (Professional use only)

Name: GK Pro 5Ltr (Professional use only)
Brand: GKProductsUK
SKU: CHE / R314 / 5LTR
Price: 84.00 GBP
Availability: InStock

Professional Patio Cleaner, Driveway Cleaner and Biological Growth Treatment

SKU: CHE / R314 / 5LTR Brand: GKProductsUK

£84.00 Ex VAT: £70.00

GK Pro is the professional cleaning solution of choice for landscapers, groundsworkers, and property maintenance contractors across the UK. A single 5-litre bottle dilutes to make up to 255 litres of product, treating approximately 1,250m² of outdoor surface, all with no harsh chemicals, no bleach, and no risk of surface damage.

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This product is approved by the HSE (no.10766) for application by professionals only. By ticking this box you confirm you are a professional user.

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The Professional's Choice for Biological Growth Removal

GK Pro has established itself as the go-to professional patio cleaner, driveway cleaner and roof cleaner for contractors who need consistent, predictable results across a wide range of surfaces and biological loading levels.

Its active ingredient, DDAC (didecyldimethylammonium chloride), is a biocidal compound that targets living cells with precision, eliminating algae, mould, lichen, biofilm, and 99.9% of bacterial matter on contact, while leaving any external hard surface completely unaffected.

Unlike bleach-based cleaners that oxidise, discolour, and degrade surfaces over time, GK Pro contains no bleach, ammonia, acids, or solvents. It will not oxidise metal, damage UPVC windows or seals, or strip paint finishes; it is formulated to only eradicate organic material.

For trade professionals working across varied properties and surface types, this means one product that can be used confidently across an entire job, without needing to assess compatibility surface by surface.

Extraordinary Surface Versatility

GK Pro is suitable for any hard outdoor substrate. It is one of the most versatile professional driveway cleaners and exterior surface treatments available in the UK, approved for use on:

Driveways and hard-standing areas: block paving, tarmac, concrete, and resin bound surfaces
Patios and paths: natural stone, sandstone, limestone, slate, porcelain, and concrete paving
Render, brick, and masonry: including painted render and external wall finishes
Roof tiles: clay, concrete, slate, and synthetic tiles (use at half dilution on tiled roofs)
Decking: timber and composite, removing biofilm that contributes to slippery surfaces
Solar panels, conservatories, and UPVC: safe on all non-living surfaces
Fibreglass boats, caravans, and polytunnels
Canvas, Astroturf, pool surrounds, and non-grass tennis courts
Historic and sensitive surfaces: including thatch, where the low-pressure application method preserves material integrity
Outdoor furniture, pots, and painted surfaces: without risk of damage to the paint film

The only surfaces excluded are green and sedum roofs.

Concentrated Formula: Outstanding Value for Trade

Each 5-litre bottle dilutes into 250 litres of product, giving a total of 255 litres ready-to-use solution per bottle. Applied via garden sprayer at standard dilution, this provides coverage of approximately 1,250m², or around 625m² on tiled roofs where a lower dilution is recommended.

Dilution can be adjusted to suit the job. Heavier biological loading benefits from a stronger concentration for faster results. Routine maintenance treatments on previously cleaned surfaces can be applied at lower concentration and still deliver effective results. In warmer weather, lower concentrations are often sufficient; in colder conditions, increasing concentration compensates for reduced dwell effectiveness.

No specialist equipment is required for smaller areas; a standard garden sprayer is sufficient. For larger professional applications, GK Pro is compatible with low-pressure spray rigs and soft-wash systems.

HSE Approved Biocide: Professional Grade Assurance

GK Pro is licensed under HSE Licence Number 10766 and has been subject to routine HSE inspection confirming the product formulation is as stated. For trade professionals who need to evidence compliance or provide product data to clients, the full Safety Data Sheet (SDS) and dilution chart are available for download below.

How It Works: Foam, Dwell, Weather

GK Pro uses a natural surfactant cleaning action. Upon application, the product foams vigorously, which is a visible indicator that the surface is receiving complete coverage. The active DDAC chemistry then kills biological matter on contact, with residual activity that continues to inhibit regrowth after the initial treatment.

The removal process works in conjunction with natural weather cycles. UV desiccates dead biological matter, while rainfall progressively removes the powdery residue from the surface. This means that on heavy biological loading such as thick algae, established lichen and long-standing mould, visible results develop over weeks and months rather than immediately.

This is not a fault in the product: it is the process.

On mild staining, results are often visible within days. On heavier contamination, significant improvement is typically seen within two to three months. In severe cases, the full result may take six to twelve months, but the outcome is predictable, and subsequent maintenance treatments work progressively faster as biological loading reduces.

Key Features

Professional-grade DDAC biocide: kills algae, mould, lichen, biofilm, and 99.9% of bacterial matter with residual activity to inhibit regrowth
Bleach, ammonia, acid, and solvent free: non-oxidising formula that will not damage surfaces, finishes, UPVC, seals, or lead works
Exceptional dilution ratio: one 5-litre bottle makes 255 litres of product, covering approximately 1,250m²
Suitable for virtually any hard substrate: from block paving and tarmac driveways to roof tiles, thatch, and fibreglass boats
Adjustable concentration: increase for heavier loading or cold weather; decrease for routine maintenance cycles
Low-pressure application: compatible with garden sprayers and soft-wash systems; no water blasting required
HSE Licence No. 10766: UK-regulated biocidal product with independently verified formulation
Professional use designation: the strongest cleaner in the GK range, trusted by landscaping, groundsworks, and property maintenance contractors across the UK

Apply on a dry, relatively wind-free day when no rain is forecast for at least four to five hours and temperatures are above 5°C and rising. Optimum results are achieved in warmer conditions where evaporation is slow, allowing the product to remain wet on the surface for longer and maximise dwell time.

GK Pro can be applied year-round though results may be slower in cold weather, but performance is maintained with appropriate concentration adjustment.

Once dry, GK Pro is safe around children and animals. It is plant-safe provided direct spraying onto foliage is avoided and any overspray should be rinsed with clean water immediately. We recommend watering all plants, and areas of grass, prior to application, and again after completion.

Storage

Store the product securely in a locked-up area in its
original container, storing it in a cool, well-ventilated space away from any combustible materials and heat. For a more comprehensive understanding, refer to the Product Information section 7.2 for conditions of safe storage, including incompatibilities.

Download Spec Sheet PDF Download Spec Sheet PDF Download Spec Sheet PDF

See The Results

Before After

GK Pro

Before After

GK Pro 1

Before After

GK Pro 2

Review by Partridge Exterior Cleaning.

Partridge Exterior Cleaning are exterior cleaning specialists based in Burton-on-Trent. Sid is gaining a sound reputation for Roof Cleaning, Driveway & Patio Cleaning, and Gutter cleaning. He is becoming quite a YouTube sensation offering advice and good technical expertise to anyone who asks. Sid is genuinely a nice bloke and has a large following on his channel.</p>

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Frequently Asked Questions

Results depend on the biological loading on the surface. Light staining can show improvement within days. Moderate contamination typically shows significant results within two to three months. In severe cases of heavily established lichen or years of untreated biological growth, the full result may take six to twelve months as weather cycles progressively remove dead material. Subsequent maintenance treatments work considerably faster as the baseline contamination level reduces.

Yes, though results are influenced by conditions. Apply on a dry day with little wind, no rain expected for at least four to five hours, and temperatures above 5°C. Warmer conditions produce faster visible results. In colder weather, increasing the dilution concentration maintains effectiveness.

Once dry, GK Pro is safe around children and animals. It is plant-safe provided it is not sprayed directly onto foliage and any overspray should be rinsed immediately with clean water. We recommend spraying water on any surrounding plants and grass prior to application, and again after completion. It may temporarily scorch foliage but will not kill established plants, and grass lawns recover quickly.

One 5-litre bottle dilutes to make 255 litres of product. At standard dilution via garden sprayer, this covers approximately 1,250m². On tiled roofs, use at half dilution, which reduces coverage to approximately 625m² per bottle.

No. GK Pro is non-oxidising and contains no bleach, acids, ammonia, or solvents. It acts only on living cells and will not interact with, discolour, or damage any non-living hard surface. It is safe on UPVC, lead works, painted surfaces, seals, and sensitive historic materials including thatch.

Yes. The standard dilution guideline provides a consistent baseline for most applications. Increase concentration for heavier biological loading, colder temperatures, or faster results. Reduce concentration for routine maintenance on previously treated surfaces or in warm weather where dwell time is extended.

Why us

Why Choose GK?

We believe in constant innovation. Our team is dedicated to finding new and better solutions that the industry needs, providing the most effective, least harmful, and safest professional-quality products to our customers.

We use high-quality active ingredients that deliver superior, longer-lasting results. By avoiding harsh chemicals, we ensure a safer cleaning process for surfaces and substrates, as well as for the environment. Whether you're an industry professional or a DIY enthusiast, you can expect our products to provide a thorough, lasting clean that leaves your surfaces pristine.

So if you're tired of products on the market delivering a sub-par clean, want to experience professional-quality results, or even find comfort in knowing that your cleaning products are safer for your surfaces and the environment, then why not try our range of GK cleaning products for yourself?

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