A 3-in-1 concentrated formula
Supplement nutrition in flowering plants, maximises flower buds and enhances flowers with natural plant extract hormones.
PK Bulk is a biostimulant that enhances and extends the flowering period. It has become the product-to-beat in indoor gardening, more concentrated than any competitor product yet still a true solution, with no suspended insolubles.
A safe and natural product without PGR’s, it is uniquely concentrated in order to yield unstoppable results.
Phosphate (P2O5): 180g/l
Potassium (K23O): 200g/l
From the end of week 2 of flowering to flush: Use just 2.5ML in 10L.
From week 7, through to flushing: Use 5ML in 10L.
Making a purchase is easy. Simply select your items, click 'Add to Bag'. The item will be added to your shopping bag. Review the items in your shopping bag by clicking the 'Basket’ link at the top of the page. Click on 'Checkout ' and follow the onscreen instructions to complete your order. If you have any problems we can help you, please contact us on 01642 224544 during our opening times.
We accept Visa, MasterCard, American Express, Visa Debit, Visa Delta, and Maestro cards. All payments are processed through a secure checkout system provided by SagePay.
For security purposes we prefer you to place an order online using our secure payment system. If however you are having difficulties placing an order online then we can assist you over the telephone.
Please be assured that we consider all of the information you share with us to be totally private and confidential.
At present we only ship to UK and Northern Ireland.
Yes. When we dispatch your order for delivery you will receive a unique tracking number by email. Once in receipt of this tracking number you can check the current status of your delivery.
All your purchases are insured against theft and accidental damage whilst in transit from Great Stuff Hydroponics to your delivery address. Once your package has been delivered and signed for at your specified address, it is no longer covered. To ensure that your purchases arrive safely and in perfect condition, we require proof of delivery for all orders and are unable to authorise for packages to be delivered without a signature.
All UK orders are shipped by UK Mail Courier. All UK orders over £300 are delivered free of charge.?We aim to deliver your items as quickly as possible but please allow 2-3 working days.
Orders may be delivered to either business or residential addresses as long as the delivery address is the same as the one registered on the credit card. A signature is required for all Great Stuff Hydroponics orders so please use a delivery address where somebody is available to sign for the delivery.
Making a return is easy as we have a no quibble returns policy. If unsuitable items are returned to us within 30 days of receipt we will be more than happy to offer you an exchange or refund provided that you return them to us in their original condition and packaging.
Before you return an item please email us at firstname.lastname@example.org to let us know and put a note in with the items you are returning with all your details and order number and reason for return.
When returning items you are strongly recommended to obtain proof of posting as we cannot accept responsibility for parcels lost in transit. We will only refund the cost of postage where the item returned is faulty.
All correctly returned items will be refunded to the original purchaser’s credit card excluding all shipping costs, international customs duties and sales taxes. Please note that card refunds may take up to 10 business days for your bank to complete, this can vary between card issuers. We will only refund the cost of postage where the item returned is faulty.
Please click the Delivery and Returns link at the bottom of the website for more information on delivery and returns or contact us with any questions.
Please note: Any items added to your basket with the stock message ' It is best if you are in a hurry for an order to contact us first.