Great for sensitive skin high quality castile soap great for the whole family countless recipes and uses our entire line of products carries a . Faqs how diluted or concentrated is the liquid soap? Our products are intended to be used just as they’re made. The only time you would want to dilute one of our liquid products is when creating recipes for household cleaning. Can you use this for hand soap foam refills? We offer a different formula that is better suited for foam refills. Although diluting improves it as a foaming refill, we find it still doesn’t work as well as our foaming formula.