Morning lads. Ive been cleaning for over 15 years now and make my water using the double DI method, i did used to have an old 300gdp ro but fell out with it as it made water way to slow. Now im looking back at this option as i need to change to a better way of making the water especially as there seems to be a national resin shortage.
My TDS is around 160. I have ok pressure, not brilliant but ok. I currently go through 5-700ltrs a day so need to make its fairly quickly into my IBC in the garage.
Ive looked at the pure freedom set up but I'm unsure on the difference between HF4 and HF5? does anyone know please?
Has anyone also got any other options? I just want the simplest to run with minimal messing and also easy to get filters when changing
Ste
The difference between the 2 is your water pressure from the tap.
HF4 works most efficiently with a water pressure of 80 to 105psi.
HF5 works most efficiently with a water pressure of 50psi to 100psi.
These specs came from the Gardiner website when they still sold membranes.
If you are using a booster pump then HF4 would probably be ok.
As I said many times; my membrane of choice was an HF5. Our water pressure is 50 psi and open flow is 13lpm from the garden tap. Our tap water tds is around 122 atm. My 4040 produces around 2 liters of pure per minute with just slightly over 2lpm of waste.
At 122 the membrane removes 97% of the dissolved solids which is pretty good considering the membrane is now virtually 8 years old. System was purchased and assembled in August 2012.
At 3ppm product water I could just get away without using resin but its too close for comfort for me. I only change resin once a year and a bag of resin lasts me 4 years.
My prefilters are 20" and I have religiously used Fiberdyne carbon block filters since the beginning and are replaced when the r/o has consumed 76K liters (waste plus pure).