There are a lot of DIY solar water heater designs out there ... These sorts of water heaters are useful for many purposes, from energy savings indoors to making your backyard pool more sustainable.

Finally, this guide from Adrienne Carrie Hubbard of Crafty Little Gnome explains how to make a DIY solar pool heater using a hula hoop, pool noodle, and black trash bag. All you need to do is ...