How to know the need for water on board?

Generally, water purifiers are used for 4 to 6 hours a day. During this time, the water used on board comes from the osmosis system. You can determine your fresh water needs based on the daily amount required for: drinking, ice, washing dishes and clothes, showers and toilets, cleaning the boat (without leaving marks) and using the toilet.

If you divide the total water needed in a day by the number of hours you want your watermaker to work per day you will get the liters per hour you need your watermaker to produce. So, for example, if the total water you need per day is 775 liters and you divide it by 5 hours of work for the watermaker then you will need a watermaker that produces about 155 liters of water per hour. Marine systems have a production range of 24 to 1280 liters per hour.