Hi nigel

Thank you ever so much for your reply, sorry to be a pain but we are new to all this. What do you mean by mounted? Ground as sitting on the ground? Is that the metal type from tolmet or elsewhere? In your own experience roughly how long does your 12000L tank last? Do you use that water solely on plants or everything?
Sorry for so many questions but im sure you comprehend being newbies. Any other information welcomed.

Thank you again TN