Hi , i have been operating a small primary school pool 11m x 4.5m for the last 6 years, it has been out of use since march due to the corona virus,and it is not due to be re-used till april of next year at the very earliest,then possibly closed till sept for a re-furb [if we secure the funding ]. my problem is showing you evidence of backwash and water testing . regards darrin power Brookside primary school,