It's going to be stored mainly because in the location there will be taps on their own (some of them anyway) so it would be better if all the water is in a ass collection area and can then be put back into the system to be used to flush the toilets. There is quite a lot of water but I'm not exactly sure on the volume.
Jennifer Wadsworth wrote:Just so I can get a handle on what you actually want to do....
--where are you getting the greywater?
--what is the volume?
--for what purpose are you wanting to store it?
Personally - I would NOT store greywater - it's not a 'best practice'. Methods of cleaning greywater for storage/reuse often involve biological or living machine systems - definitely more complex.