tolhas I think he is talking about the Waterfarm made by Hydrofarm. It comes with an air pump and everything you need to get started. I started hydro with this system. After my first grow with the Waterfarm, I wanted to make some changes to the unit. I wanted a drain valve to make changing nutrients simple. You can use the sight indicator to drain the tank but it was a pain in my grow to do. Then I noticed the air pump it came with made very little pressure and the bubbles all came up in one spot.
I did not want to ruin my store bought unit, so I made my own with the gear that suited my grow and grow style. I ripped-off the sight indicator idea from the waterfarm. I felt more bubbles would be better so I got a good pump that could run 2 stones. After it was said and done, I spent more money making my own unit (like mrtwomuchskill stated above). The pump was 75% of the whole cost.
I grew another cycle with my home made job and the waterfarm. I got alot more growth from the 5 gallon bucket then from my waterfarm. I posted the question on Overgrow.com, "why do I get a faster growth rate from the 5-gallon bucket then from the Waterfarm?". Most everybody had the same answer,
root space. I felt it had to do with air bubbles but no one agreed with me. The waterfarm has 2.5 gallons of root space and the 5-gallon bucket had almost 5-gallons of space for roots to grow.
I tried the waterfarm a few more times before I gave it away.
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hey Rumple I added it up and cost about 60 to make you think I would be better off getting the hyfrofarm
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My answer to this is you might want to think about buying the complet Waterfarm unit. It will cost less then my method and you won't have to build anything. I still feel my unit is better and fits my grow needs more. I posted this to give people ideas and another prespective to DWC growing.
Peace, R.