What are the benefits of a plastic tank compared to metallic tanks?

Plastic rain water tanks have several advantages over the traditional galvanized steel or metallic water tanks. Their seamless construction provides them with greater impact strength and superior resistance to corrosion.

These virtually indestructible tanks have a longer lifespan than metallic tanks, which can corrode through and leak. Plastic rainwater tanks can easily to handle, and are simple to install. This characteristic provides savings in size, weight and cost. Plastic tanks also cost less overall than metallic tanks.

Plastic rainwater tanks are the most conventional, economical, most widely chosen rainwater tank bought these days.

What are the benefits of a plastic tank compared to concrete / masonry tanks?

Concrete/ Masonry tanks are very heavy, and difficult to handle. New concrete water tanks often impart tastes and may leach lime thereby increasing the pH of water. Cracking and leaking is one of the most common complaints suffered by concrete tanks. Cemented / Masonry tanks may be damaged by earthquakes. They are more expensive to buy and install than plastic tanks. Polyethylene is non-corrosive tank material designed for long life. Polyethylene will not rust or suffer from corrosion as will concrete during their service life. Plastic water tanks are lightweight and easy to handle – no heavy equipment needed.
Plastic water tanks are usually made in one single piece. They have no joints or seams and require minimal maintenance.