A DI only system has that low(er) initial investment cost. But, the cost of the DI only system is about 10 times more expensive to run than the multistage system. Want to see how we came up with those numbers? Click Here. On the other hand, the purchase of a multistage system has a significantly higher upfront investment costs, but is 10 times less expensive to run. So, even though a DI only system is less expensive up front, multi-stage will cost you less over time.
TDS ReadingsAnother consideration is the TDS reading on your water. When you take a reading on the water that comes from the faucet, it may be a low reading. This could be useful because it could possibly mean that your WaterFed® system won’t have to do as much work and therefore a DI only system makes sense because the water won’t require you to change the filter as often. That could mean the cost of running your system is less expensive than originally anticipated. But, it is important to know, that even within a small geographic area, TDS reading for water can vary widely.
But Let’s Not Discount DI Only Systems…
The other reason you might consider a DI only system is because the system has little water restriction and can therefore reach higher up, without having to purchase a pump. If you want to learn more about pumps for WaterFed® systems, click here. The reason there is less water resistance is because the water is only being pushed through one filter, as opposed to two or three filters. This means that the water pressure from your tap has less standing in the way of getting to your pole than if the water were to work its way through a multistage system.