Although these are important, still they aren’t the first. With these factors others things should also be considered which is equally important. In terms of materials, the tanker should be of stainless steel that has the potential to prevent water from algae and other harmful things.
http://www.authorstream.com/Presentation/beltecnoglobal-3879515-why-purchase-stainless-steel-water-tanks-india/

The beautiful diamond shape on our panels provide, structural strength to the whole tank and helps in creating uniformly distributed load.

The RO water storage tanks offer cost benefits, so they have been characterized as the most preferred water tanks. In addition, stainless steel is a hygienic material.
beltecnoglobal.wordpress.com/2019/07/04/benefits-of-stainless-steel-water-tanks/

In the manufacturing industry, water tanks are available in various materials like concrete, steel, and polyethylene, with each having their own benefits. However, stainless steel (SS) tanks are considered to be the best choice overall.
https://www103.zippyshare.com/v/vNAcB9ff/file.html

Since 1947, we are manufacturing the stainless steel building equipment’s. Especially in stainless steel water tanks (Panel tanks and storage tanks) we are the market leader in Japan. Because of our excellent quality & technology along with experience and R&D of decades makes us different from other players in the field of SS tanks
https://www.goodreads.com/user/show/100724045-beltecno-global

Storage of water in tanks is an ancient practice perfected by several thriving civilizations mainly for domestic and then agricultural use. The Indus Valley Civilization was the prime example of engineering marvels in terms of water tank construction.
https://www64.zippyshare.com/v/EfenSsk0/file.html