Hey there weedhound. Thank you for the very informative thread here on the waterfarms. :thumbsup:I have Been using the waterfarm method for years. I run 25-30 buckets. But I use a 55 Gal res and a 32 Gal controller. I would like to do this upgrade to my system. In the past I have manually hooked up a submersible pump to pump out all of my nutrients from my buckets when I do reservoir changes just because of that lack of circulation the waterfarms have. Its a real pain to do it, making sure each bucket is drained of its old nutrient contents. Im thinking of adding a second controller to my grow. I think if I split the grow in half and operate on 2 controllers instead of the 1 it would be more efficient. Just my thought. Kinda curious of your opinion. My question is If I want to recirculate my system with 25-30 plants how big of external pump is gonna be needed. I think obviously it has to be bigger than the one made for the 8 pack up grade.

Here are some pics of my setup.






This is the air pump that powers all of the pumping columns. Very efficient and quiet. Could definitely handle more buckets if needed.