we are using a solar powered fan to inflate the 2 layers of plastic to create a insulated pocket between them it gets very cold and snowy here in the winter
a view of the solar panels

now for the system
we have 2 275 gallon ibc's tied togetherwith a 2"pvc pipe with shutoff's and a union to disconnect them

we have 18 blue barrel's filled with pea gravel that drain into a sump tank that contains red crayfish

water is pumped back to the tanks with a sump pump and split between the tanks