The purpose of ULTRA-PURE WATER is to get a spot-free rinse at the end of your 'window washing' process. All spot-free water is indentical - typically defined as having a TDS of <10ppm - that means there are less than 10 parts per million of Total Dissolved Solids. In fact, depending on what minerals are in your local water, spot-free can be up to 50ppm (town water with very low levels of calcium and magnesium).
The final stage of any PURE WATER SYSTEM is the Mixed Bed DI RESIN - this ionically attracts minerals from the water to leave it ultra-pure. This can also be the first and only stage, ideal for TDS up to 150ppm. If you are not sure what is your local water quality, you can ask CHAT GPT "What is the Total Dissolved Solids or Conductivity of town water in [MY TOWN] expressed in parts per million". Repeat for each of your service areas as the answer is dependent on the actual source of your town supply water.
If the TDS >100 and certainly if it is >150, the use of DI ONLY becomes quite expensive in both dollars and time (you need to keep changing the resin). This is when it is commercially viable to consider using a REVERSE OSMOSIS system. Reverse Osmosis uses water pressure to remove up to 95% of the minerals in your water - basically for free. This pure water then passes through a DI TANK to polish the water to 'ultra-pure' or 'spot-free'.
We recommend the following :
TDS <50ppm : SINGLE 1/4cuft (6 liter) DI TANK
TDS 50-150ppm : DUAL DI TANK
TDS >100 : FLOW BLUE, FLOW RED, or FLOW GOLD
Which RODI SYSTEM, When ?
FLOW BLUE V1 CORE : A single 4040 RODI System, ideal for Truck Mount system with WALL MOUNT
FLOW BLUE V2 PRO : A single 4040 RODI System with meters, this is ideal as as a Cart System with TROLLEY KIT
FLOW BLUE V3 DUAL CORE : Using 2x V1 CORE with Wall Mounts and REACH-iT PUMP, this is a compact DOUBLE Flow-rate solution for multiple operators or Pressure Washers / Drone Operators.
FLOW RED+ : A twin 4021 RO Cart System with a low profile and stunning impression.
FLOW GOLD : This is the most advanced RODI System in the market, with twin 4021 RO's A 12V Booster Pump, a 12V Delivery Pump and the option of a 20AmpHr Super Battery on board, FLOW GOLD is really a MOBILE TRUCK MOUNT system that can work with, and without a water tank. This is for an educated / educatable operator as it has a lot of controls that you can adjust to maximize your pure water output.