There is an air gap between the inner and outer of a round tank which helps reduce condensation and improve security | Square tanks often have common tops (single skin) which causes more condensation and also compromises security |
These tanks have a smaller base which will help to prevent condensation build up | These tanks have a flat base which means water from condensation will eventually fill the base of the tank |
Bulk round tanks can be manufactured with a slightly sloping base. This means all water can be extracted at one end | Some square tanks are manufactured with a suction point at one end. This WILL NOT remove all the water & sludge from the base or corners of the tank |
Round tanks do not have corners for the bacteria to grow in | Condensation and water in the corners of the tank will eventually grow bacteria. This in turn can clog filters and damage equipment |