For the most part, yes, you can change the flush system to help you save up on water and cost. If you have a single flush system toilet, and if you’re more of a handyman, changing your single flush to a dual flush system should be fairly easy and should only take about 15-30 minutes. You’ll need to purchase a dual-flush conversion kit with a proper flush valve. But before doing it, remember to check if your model is suitable for that conversion.