20 litre Root Pruning AIRPOTS are available for £7.45 at Green Light Hydroponics and Organic Specialists in Gloucester. Our fully trained staff can help you with advice on these and many other new products. Posted on August 10, 2014 by Green light Hydroponics & CBD Specialists Gloucester 20 litre Root Pruning AIRPOTS are available for £7.45 at Green Light Hydroponics and Organic Specialists in Gloucester. Our fully trained staff can help you with advice on these and many other new products.. Share this:TwitterFacebookLike this:Like Loading...