They also prioritized finding methods that were effective, yet not too costly. Sanitation cost is the main issue for many foreign (not the United States) countries. The average cost of home water and sanitation systems start at $50 a month, when many citizens don't make enough money to use on non-necessities.
In this context, they prioritized finding methods that were economical yet not excessively expensive. For many foreign nations (excluding the United States), sanitation expenses are a major concern. The average cost of home water and sanitation systems starts at $50 per month, which is often unaffordable for citizens who cannot afford to spend on non-essential goods.