I've now completed initial testing on the QuenchSea desalinator.
I made up a 3500 ppm (3.5%) NaCl solution using table salt
and seawater in 2 litre plastic bottles. A taste test confirmed the solution tasted pretty similar to clean seawater.
The initial recommended cleaning
of the QuenchSea produced two obvious problems. Firstly, water
leaked out of the pressure release valve screw that required tightening up with a tool far more than hand tight. Secondly, and more critically, a significant amount of water
leaked out from the underside of the plastic body.
I felt the leak from the body was due to a bad seal around the filter. To inspect and remove the filter requires the large black plastic screw to be removed by turning it counter clockwise. This proved impossible by hand, it was done up too tightly. I placed the black plastic screw in a bench vice (suitably padded) and turned the body of the QuenchSea, that did the trick. The 31mm O ring on the black cap had been pinched and damaged on assembly (see photo)
I replaced the O ring and reassembled.
Testing involved 2 x 2 litre bottles of "seawater" made up as above.
TDS 331 ppm output volume about 60 ml. Taste was acceptable. Pumping time about 7 minutes.
TDS 440 ppm output volume about 50ml. Taste was acceptable. Pumping time about 8 minutes.
Pumping is hard work
but perfectly achievable.
Despite changing one of the filter seals
a large quantity of water leaked out of the machine body during pumping. I would estimate about 300 ml out of the total 2000 ml leaked out. Clearly the internal seals
are not holding the maximum pressure of about 60 psi.
I will write to QuenchSea regarding the leaking.
In conclusion my feelings are this machine is still in the prototype stage, but works in principle. A solid surface is definitely required for effective pumping action.
I think modifications and improvements are needed to be effective in a liferaft
. However, as mentioned earlier, yachting and liferafts are not the intended markets.
The 4 litres per hour stated output is very optimistic. With a leaking machine you'd be lucky to achieve 400 ml per hour of drinkable water after 60 minutes of continuous pumping. However, the output would almost certainly increase considerably if the leaks
I'll report further once I hear back from QuenchSea.