Hi It is not the watering system as they are used by millions of people all around the world with great success. It is very difficult to establish the issue you are having from this information…. A great suggestion is to join the AutoPot Users Group on FaceBook there are over 4,000 members from around the world helping each other grow correctly and they are very helpful. Join up and they will be able to help you how to grow properly…. cheers Josh