Hi all, Looking to go WFP from trad in the near future and have a couple of questions for those of you with the knowledge. Going to produce my pure water with an RO system and store in a 650 litre tank in a garden shed. My worry is that the shed is going to be about 20/25 metres from the nearest drain. Will the waste water travel this far back up my garden to the drain or will it be ok let the waste pipe just water the garden? Secondly I was looking at a 450 GPD RO system. Does anyone have one of these as I would like to estimate how long it will take to fill the tank. I believe it's down to water pressure so I guess it could vary quite a bit. Do the booster pumps really help? Lastly, is a DI filter after the RO optional or a must in a hard water area.? Thanks for any advice you can give. Arnie.