The Fixed Solids is the term applied to the residue of any one of the following Total Solids, Total Suspended Solids, or Total Dissolved Solids after igniting at 500 ± 50ºC

total dissolved solids is how much of the solid is dissolved in the liquid, while suspended total suspended solids is the amount of the solid floating in the liquid. e.g. if you had a solution with both and you filtered the solution then evaporated out the liquid, the solids that you filtered out would be the suspended solids, and the the solids remaining after evaporating the liquid out would be the disolved solids.

Total solids (TS) is the total amount(sum) of organic and inorganic solid materials that are suspended and those that are dissolved. Total volatile solids( VS) are organic compounds of animal and plant origin. Total solids is therefore composed of VS and Fixed solids.

The level of total dissolved solids in water does affect chlorine disinfection. That's why there is a recommended specification for the level of total dissolved solids in water for the water that is sent to homes.