Loop diuretics are first line for acute congestive heart failure. That should help you remember that they are the most potent diuretics, so they're often used in the acute treatment of edema.

Furosemide and other loop diuretics are indicated for use in volume overload secondary to renal failure. Recall loop diuretics inhibit the Na+/K+/Cl- pump at the thick ascending loop of Henle, which messes with the hypertonicity of the medulla and therefore prevents urine from being concentrated. This results in increased fluid loss to urine, and is helpful in treating symptoms of edema.

Chronic renal failure = High potassium in blood (page 590 FA19) Furosamide is the strongest diuretic on that list that also depletes Potassium