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Hey R, im new to this site and have never grown before. Got to say first of sick post. Then the few questions i have.
1. I think i understand all the constuction but im not sure how you get fresh watter in, Even with that top valve
2. Im sure this is a real noob question ( thats what i am) You are not using just watter but what els is need in there as far as nutrients, or did i just overlook that somwhere
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You can fill your buckets right through the rocks or gravity/pump feed it into the fill hole. I use a bucket with a valve attached to the bottom of it, hook it to the fill hole via a small pond pump. I used this same way of filling with out the pond pump as well. Just set it on a chair and hook a hose from the bucket with a valve on the bottom to the bubble-bucket fill hole.
I wrote this thread to help folks build a bubble-bucket. If you want to learn how to grow using hydroponics, then you need to check out some of the other great threads here at Grasscity. Its kinda like asking your mechanic for driving lessons. He could teach you, but he may not be your best resource.
R.