Block Paving Eco Cleaner. 8x 390g Pouches. Removes and Prevents Algae, Moss and Black Spot. Deters Weed Growth for up to 6 Months. Treats 120 sq/m. They’re child and pet safe, 100% biodegradable, non-abrasive and contain no bleach, acids or biocides.DirectionsStep 1: Fill a 10 litre plastic watering can with cold water.
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