its uncessary if you do it right. the wardog method ( letting the frozen distilled water thaw over the mixture) will yield nice big crystals that are easy to filter. I did this not to long ago for test prop (just to increase the purity) and recoved 98% of the product. while you will lose the ester wieght you should be able to recover most of the actually tren.
yes this will work for almost any esters of any hormone.