Thanks for a quick reply to my question Gps Frontier, I have built my system off this web site:
http://www.ai.hydroponics-diy.com/node/69 I am now thinking I may have built the wrong type,The biggest bucket I have set up is what we would call a general household bucket here in New Zealand its holds about 10 liters of water (2.5 US Gallons???) The type of Tomatoes I was going to have a go at growing is the Beef Steak/Money Maker type.and I have made another system for growing lettuce as I was told it would be better to have 2 systems so I could have different
nutrient strengths.
Over here in New Zealand we are about mid winter but its been very mild so far only have had 1 light frost, (
Napier Weather - NZ Weather Forecast Napier from MetService.com) normally plant Tomatoes out in the garden in mid October but was given a glass house (not heated) so thought I might give hydroponics a go and get some early crops