I always mix 2ml bac water with 5000iu hcg for easy maths.
That gives me 20 pins @ 250iu if drawn to 0.1 on insulin pin.
Keep about 6 in the fridge and the rest in freezer. Obvs letting thaw out when needed.
The solvent hcg comes with is designed for 1 time usage for its actual medical purposes.
Dicth it, get bac water. Or if your Rich Pianna and do massive doses of hcg on pct you can use it.