Pythoff Reservoir Tank Sterilising Agent For a full spectrum sterilising agent - use Pythoff. It has a unique formulation that dissolves into your nutrient solution and stays active for longer than standard; it sterilises all surfaces -including tanks, pumps, drip lines, media - the lot. It's great for preventing and treating Pythium that could devastate your crop. Unique sterilising agent Sterilises your system and nutrient solution Eliminates harmful pathogens Prevents and treats Pythium Long-lasting - the only one that beats it is Silver Bullet Roots Feeding Info Cutting/Seedling 0.1ml Vegetative Stage 0.2ml Flowering Stage 0.2ml Note: Do not use with any beneficial bacteria or fungi based products. Swap To Silver Bullet Roots For best results, swap to Silver Bullet Roots. It's like Oxy-Plus 11.9% but has silver ions! These silver ions: Break down the protective barrier of bacteria Make the hydrogen peroxide molecules more effective Keep the H2O2 molecules active in tanks for up to 5 weeks! Silver Bullet's so good that you hardly ever have to dose, and when you do, dose rates are stupidly low - by switching to Silver Bullet you'll save 55%!