First thing, don't use sterile water for your HCG. Thats only meant for when you use the whole thing at once. You want bacteriostatic water. You can find that for cheap all over. As for the letro, you mention this for PCT. There should be little to no need. It doesn't hurt to control a little estrogen while on PCT but thats like .5mg adex 2x wk. Letro is strong. It builds up and can destroy estrogen levels if you aren't careful. We don't want to get rid of all estrogen, just keep it in the normal range at best.