Individual ion exchange bed, other than grouped together according to its functional groups can also be divided into different types based on its solubility. Naturally for it to be effective, the materials must be insoluble under normal conditions and for that to happen, usually high molecular weight compound has to be selected. Bead size is also another criteria that determines the type of resin suitable for general application. Basically a certain granular size is needed so that the molecules that form the whole structure do not hold on together too compact and there must be a certain void volume to prevent massive liquid head loss. The characteristics on how the beads are arranged will also affect the ion exchange bed physical durability whether it is good enough to withstand expansion and contraction due to change of temperature without risk of bursting or collapsing taking place. One more thing to take note is that depending on the procedures used for backwashing and especially in cases whereby there is an uncontrolled high flowrate caused by mishandling, this can lead to blowoff of resins coming out from the vessel and resulting in capacity loss of the beds. Therefore, typical attrition losses can be expected to be within 5 to 20% depending on which type of ion exchange resin used in the systems.