Yeah, I stopped asking people to read the whole thread. It's just not practical for a simple build.
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Why anyway would you make a hole closer to the bottom?
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Locating a valve at the bottom or base of the bucket will give you a point to drain and connect the buckets. If all the buckets are connected in series at the base/bottom they will all find the same fluid level. If you hook them in series to the center or top, they will not act as a unit. When the level drops past the connection it will not fill the other buckets.
I have changed the fill hole to the bucket lid. A few changes have been made over the years. Filling through the lid is much better and safer.
If you hook your buckets in series, you only need one sight indicator in the whole series (less holes to drill).
DWC/Bubble Buckets are great for one to four plants. The maintenance and monitoring is just too much for more then four plants. Your best bet would be flood tables. Tables can be set up in a day without issue.