hydrochloric acid

Need Hydrochloric acid 5L with discreet shipping (Fedex/DHL shipping recommended). Will pay premium price (Only with escrow)

Hi ! I now have to use 300ml of 37% hydrochloric acid. But I find the smoke too intense and can't really work through. That's why I want to use the 23% hydrochloric acid. How much do I need from 23% to get the same effect as the 300ml of 37%? Thanks in advance