What is the best storage tank for my rainwater catchment system?
Rainwater from your roof needs to be stored for future use and there are many types and manufacturers of water storage tanks. Above ground plastic tanks are a economical way to store rainwater. Most potable plastic water tanks are made from Polyethylene and it is recommended that they be “tumble molted”.
Sizes vary from a simple 50 gallon rain barrel all the way up to 10,000 gallons. All should have a UV protection warranty for at least 8 years. Dark colors are recommended to alleviate light penetration which can cause algae growth. Multiple tanks can be manifolded together to achieve the volume of storage needed. Keep in mind that plumbing should be under ground for frost protection.
There are vertical cylinder plastic water tanks if you have a large area for storage. Slim line design plastic water tanks are best suited for urban settings where space is an issue. There are box type plastic water tanks for storage under decks.
All rainwater storage tanks should be NSF approved for drinking water, should you decide to go potable now or in the future. There is a tank that will fit every application.
In the next installment of this series, we will discuss steel tanks with poly liners.