The Cyco range features two PK boosters. The first is 'Potash Plus', used during the first 4 weeks of flower. The second is 'Swell', which you should use for the final weeks of the bloom phase, finishing just before the final flush. Swell has been formulated to increase final weights, by filling out fruits and increasing the production of essential oils. So not only will you increase the size of the harvest, you'll also be producing a much better end-product. Optimised for the final weeks of the bloom phase, from week 5. Encourages fruits to fill-out and swell. Piles on the weight during the final stages. Can be used right up until the final flush. Added to your nutrient solution at a rate of 2.5ml per litre. Increases yields in any growing medium or grow system.