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125psi is ultra low pressure when compared to 600psi. However, it's far from ultra low pressure when it comes to our tap water pressure of around 50 to 60psi.If it's an ultra low pressure membrane surely you shouldn't be using a booster pump.
So why sell "low" and "high" pressure membranes if they both handle the same pressure for our requirements125psi is ultra low pressure when compared to 600psi. However, it's far from ultra low pressure when it comes to our tap water pressure of around 50 to 60psi.
He sells low pressure membranes that are as high as high pressure. Surely if they are meant to be run at the same max pressure they shouldn't be called low and high, especially when being sold for our application600psi are membranes used for water makers on yachts to make drinking water by desalination.
All they want to do is sell their product. The Chinese are good at copying other's product description and using it to describe their own, even if it isn't accurate.
Just recently Doug noted that the only true low pressure membrane is the Axeon HF5, but their pricing is no longer making it a viable solution.
Dougs site list an AXEON HF5 as 80psi and an AXEON HF4 as 100psi.I stand to be corrected but thought high pressure membranes for our use were 100 psi and low pressure ones were around 50psi ?….
That's what I thought, hence my first reply but apparently the "low" pressure membranes have a standard operating pressure of 80psi compared to 100psi for "high" pressure membranesI stand to be corrected but thought high pressure membranes for our use were 100 psi and low pressure ones were around 50psi ?….
All very thorough as always but it still doesn't explain why they're called low and high.pressure. By the figures quoted even the "high" pressure membrane is ultra low compared to 600psiI copied this many years ago from Alex's site.
HF4 Axeon membrane.
- Commercial AXEON HF4 Low-Pressure 4040 40" Membrane
- Optimum input pressure range 80-105psi (5.3-7 BAR)
- Average Rejection ratio - 98% (200ppm down to 4ppm with input water at 100psi and 25°C input water temperature)
- Recommended waste water ratios (product:waste) - 1:1 under 100ppm, 1:2 100-250ppm, 1:3 250-400ppm
- Suitable for standard water input temperatures +10°C
- Nominal 2,500gpd rating - Real world will produce from 2000-4500 litres per 24 hour day
HF5 Axeon membrane
· Commercial AXEON HF5 Ultra Low-Pressure 4040 40" Membrane
· Optimum Input Water Pressure range is 50-100PSI (3.4-7 BAR)
· Suitable for low water temperature inputs below 10°C & generally lower pressure than the HF4 RO Membranes
· Average Rejection ratio - 97% (200ppm down to 6ppm with input water at 100psi and 25°C input water temperature)
· Recommended waste water ratios (product:waste) - 1:1.5 under 100ppm, 1:2 100-250ppm, 1:3 250-400ppm
· Nominal 3,000gpd rating - Real world will produce from 2000-5000 litres per 24 hour day
Our water pressure has been 50psi for years until just recently where it has increased to 55psi. When my HF5 membrane was new I was getting a rejection rate of 98% without a booster pump. Now my rejection rate is 97% when I last checked a few months ago. This HF5 membrane is just a few months over 10 years old.
Before I settled on an HF5 membrane, I phoned Purefreedom. They advised that an HF4 and an HF5 would perform the same on my 50psi water pressure. Their advice just didn't make sense to me, so I went with my gut and ordered the more expensive HF5. Would the HF4 membrane performed the same as an HF5 with our water pressure? I don't know.
It's marketing to a target market. I can just imagine how many purchasers have been persuaded to buy an ultra low pressure membrane reading their description.All very thorough as always but it still doesn't explain why they're called low and high.pressure. By the figures quoted even the "high" pressure membrane is ultra low compared to 600psi
None of us had any clue how dangerous it was standing in the back of a moving pickup (bakkie) driving down the road and screaming around corners at speed either. Those were crazy days. I'm surprised that we are still alive. Now I think twice about climbing onto a flat roof to clean a window.@ Spruce - Ford is the biggest joke in SA now, they always break down.
My youth was spent in a Toyota Pick Up standing up in the back bouncing up and down on the dirt roads to the farm. Then you played the game who would move first when the branches were just about to hit your face ?
None of us had any clue how dangerous it was standing in the back of a moving pickup (bakkie) driving down the road and screaming around corners at speed either. Those were crazy days. I'm surprised that we are still alive. Now I think twice about climbing onto a flat roof to clean a window.
Back in 1981/2 I worked for Ames in Que Que. I was given an Alfa Sud as a company car. When I requested that front seat belts be fitted for my own safety, the CEO in Bulawayo nearly died laughing.
If you are referring to the red dust that came from the blast furnace at Risco (later Zisco) then you are right there. The prevailing winds used take the dust away from Redcliffe residential area but deposit some of it over the township to the west. Occasionally the wind would blow in the other direction and our cars were just full of red dust. In fact everything we owned was covered in the stuff.Back then my old bokkie used to clean the windows and get people knocking on the door asking how does he get his windows to shine. Good old Windolene is inside and out.
Had some great times in Que Que at my uncles peanut farm. Que Que well known for red smoke ?
If I remember it was off the road to Kokwe on the right and good couple of miles of dirt track.When abouts was your uncle's peanut farm Doug?