Put water to the system today. Boy the leaks. Not from the threaded joints but because I can't seem to get decent worm drive clamps here. Going back to Australia soon and will have a fair list of bits and pieces to get.
As for the timer, maybe I'm second guessing my self and one wont be needed however it's my gut feeling and I work a lot on these it's going to be better to have more flood and drain cycles than less. Will have to work my way through it. Hydraulics Engineer for 40 odd years.
Also happy with the flood and draining times so far. As you can see from the pics I'm using two 100 Litre plastic containers for my resivours and have a submersable
pump in one and will route the overflow back to the second one use the full capacity of
nutrient in both drums. Would be easy to fit a solinoid controlled valve to have to system drain back to the second drum if I feel there is need to do so.
Thanks for the interest in my system and it'a all thought provocking.
CIAO Leon...