here is a bit of good news for us in the wfp industry... if you contact your water board and tell them you are a wfp user you can have your water bills reduced and in some fantastic case claim a nice juicy refund. they calc that if you draw off some many litre that you are going to run it down your drain but in our case we take it offsite and so we should not be charged for this..give it a go and let me know how you get on...