So, I've recently tried adding a fish tank filter to my 25 gal hydro res.
Holy crap...the results are amazing!!
I have never seen such a clean res, or such healthy plants!
I have for years run no dump res and experimented with all sorts of different combos of products. Some worked some didn't. By the end...or even the middle of the run I would get some slime building up on my air lines and pump lines. Always made it through though, then would just scrub everything out. No problem.
Now I have added a simple, cheap fish tank filter (tetra) right from wally world. Bio bag filter...which you replace monthly (cheap, couple of bucks )...which harbors/ cultivates beneficial bacteria, and a simple mesh filter which can be washed out.
I'm running GH 3 part, keeping an eye on my EC, that's it. Looks like I could drink my solution, just slightly tinted color. Gorgeous results. I have been foliar feeding with Flourolicous Plus and a carbo product. The plants look incredible!!
I have yet to see it all the way through...I'm currently 4 weeks into 8.5 or 9. (just in the wanting of disclosure) But so far so very good. (And I've seen enough to have a handle on what's happening, and how it will turn out!!)
Just wanted to share...I'm always trying to help others out, and like the thread title says this is the best thing I've ever seen. I added the 10-30 gal version to my one res...they even have a 2-10 gal version which I put into my EZ cloner...all very promising!! I currently have plans to add one to each of my reservoirs. I'm even thinking that the 2-10 gal one would work great in a "side show" 5 gal DWC.
So far the only "bad" thing I have even remotely noticed is the need of a touch more of the "green" bottle (couple of extra mL per gal) That's it!
Let me know if anyone knows of any reason not to use fish filters in hydro...otherwise everyone should add one tomorrow!! It's incredible!
Good Luck all