I agree with [USER=38167]@xqfq[/USER]
Eplerenone or amiloride are two mild potassium sparing diuretics that have worked for me.
Post #2: Water Retention Caused by Testosterone May Have Nothing to Do with Estradiol
Post #17: How many of you are on diuretics for water retention on TRT?
I like amiloride best since it is a non-MRA (mineralcortocoid receptor antagonist) which has less negative effect on erectile function. Read post #3 here: Hypertension medications and erectile dysfunction