Stable defoamant composition containing GTL fluid and/or hydrodewaxate and/or hydroisomerized/catalytic (and/or solvent) dewaxed fluid as diluent

A stable defoamant solution comprising a defoamant/antifoam agent dissolved in a diluent fluid wherein the diluent fluid is selected from the group consisting of GTL fluid, hydrodewaxed waxy feed fluid, hydroisomerized/catalytic (and/or solvent) dewaxed waxy feed derived fluid and mixtures thereof, wherein said fluid is characterized by boiling in the range of about 300° F. to about 750° F. the range recited corresponding to the initial boiling point (IBP) and to the final boiling point (FBP) of the diluent fluid and a kinematic viscosity (KV) at 40° C. in the range of about 1.2 to 4.5 mm2/s, wherein the defoamant/antifoam agent is present in the defoamant solution in an amount in the range of from about 0.05 to about 50 wt % and the defoamant/antifoam agent is selected from the group consisting of silicone and fluorosilicone defoamant/antifoam agent compositions and wherein the defoamant solution is characterized as being clear and bright and marked by the absence of fish eyes over a period of three weeks.