Yes I got a message that my inbox was full.. So I had to spend some time deleting things in my inbox. I think you will have to send your PM once again. I am sorry about that. If you are building on the scale you are talking about. I would look in to a sieve that well save you a lot of headaches in the future. The using a moving bed filter would also be a great thing. There are many ideas out there for filtration you have to look for the ones that don't create a lot of maintenance and cost. Plan something that can be used over and over. Taiwan if a wonderful place to grow vegetables as in the winter we can grow western vegetables and in the summer we can grow asian vegetables. Just those bloody insects have got me to the point of shutting down. as I have no room to build a nice green house. Those mini green houses just slow the bugs down but it doesn't keep them out.