This paper presents a proposal to deal with imbalance phase loading phenomenon in power distribution system. Discrete switched passive shunt compensators are considered as the means to help balancing phase loading. Discrete switched passive compensator offers advantages in term of installation cost and simplifies the maintenance process. A new algorithm is developed to calculate the size of those compensators, this algorithm consists of the unbalance power flow calculation module and discrete optimal sizing module. In addition, the algorithm is written in MATLAB language and tested on actual data of a distribution feeder. All the tests have proven the effectiveness of the proposal and shown the advantages of proposal over others. Moreover, this proposal can be utilized as an useful tool for any electrical utilities.