The main factors that determine the selection of correct water tank are the intended purpose of use and the situation of installation place.
The best alternative for storage of potable water and fresh water is polyethylene water tank. The customer should ask the manufacturer whether the water tank to be purchased is food grade and UV stabilized or not.
For chemical material storage, the resin / raw material of the tank should be appropriate for storage of that particular chemicals to be stored.
For the storage of material or liquids with density above 1 gr/cm³, reinforced tanks (by material increment and thickness increment proportionally) should be selected.
In case of installation of tanks with high volumes at places with narrow entrances, the best alternative will be onsite assembled tanks. In this sense, fiberglass reinforced polyester (FRP or GRP) tanks are being used for many years as the most practical and easy to use solutions. In this application, unassembled body, side cambers and feet of the tank are transported to the installation place and assembly process takes place on site. The tank is ready to use the next day.
For the places with narrow entrances but high ceilings, pipe type vertical water tanks are good options.
The most common tanks used for rain water harvesting, effluent and septic implementations are fiberglass reinforced polyester water tanks. Another important point to be taken into consideration is that the tank should be reinforced adequately and the height of the manhole should be appropriate for the purpose of use. In this sense, the best method is to conceptualize the project and to design the tank accordingly.
Apart from all these, the tank should be corrosion free and the inner surface shold be cleanable with ease.