I installed a tank many year ago on a Builders sand base. Over the years the sand has moved away at the back and the tank is tilted backwards. I need to empty the tank so that I can move it off the base, refill the sand and improve the wooden surround. Or should I go for concrete?
My problem is how to remove all the water to make the tank light enough to move, without splitting it. Yes it is plastic. There would be say 400 litres in it when it is drained out at the tank tap.