Just in case anyone needs to know, Ive found using the Wilma systems with soil works well just don't water too much, and water during daytime only. I water/feed 2x 15 mins (week2-week4 Veg), 3x 15 mins (week5-week6 Veg), 3x 15 mins (week7-week11 Flower) and for the final week no feed just watering 3x 15 min per day. I dont use the wilma for a recirculating system but a run to waste, not as it was intended but it means I dont have to worry about the system getting blocked with nasty little bits in the run off which is basically un-avoidable, Using the the drip/dippers rather than the flood/drippers ensures that not much run off is created by a 15 minute watering anyway (this is true of the 11l pots I use) this may change depending on which size pots you are using as the wilma comes in 6.5L, 11L & Big 18L pots depending on the system. The drainage hole back to the reservior is blocked up to ensure nothing re-enters the system and empty what ever collects in the tray, but I have found that with 2x 15 minute feeds, so far, very little run off is created & what little there is evaporates in an ambient temp of 25 degrees c this has provided a little humidity that I needed as my humidity sticks between 40-45%. The main thing here is once you have your system up and running and made all checks, happy all is working smoothly, is to simply keep an eye on your reservior and as there is no run off interferrence you will find once it has been set it will only need minimal adjustments if any at all. S.K