We do not have
a pre-pump. I was unaware of the air issue. For the most part I do not see air
in the system (via the float gauge). Once and a while there is air during the
start up if the sea-chest filter is not all the way full. But, this is not the
- Cream Puff - SM2K - #275
cruising - Tahiti, French Polynesia
main@AmelYachtOwners.groups.io [mailto:main@AmelYachtOwners.groups.io] On
Behalf Of Ken Powers SV Aquarius
Sent: Sunday, April 19, 2020 2:39 AM
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes
On Aquarius, we also have this problem with our 24V D60. We continually
see an increase in the ppm each year. I have a few questions so we might
flush this out...
1) Do you have a pre-pump that feeds your high pressure pump?
2) For those that have a pre-pump, do you see this problem?
I am starting to get the feeling that cavitation do to air in the system is
causing the problem on Aquarius. We only have a single sea water intake,
stock Amel, and we do make water while motor sailing, and this could cause air
to get into the water-maker system. With the air in the system I am led
to believe this is like a jack hammer on the membranes causing micro tears to
form. Overtime, the holes get bigger, and whaalaa 1000 ppm.
I don't have the pre-pump on Aquarius, but I am planing to add the pump when I
install new membranes in about 6 months.
Does anyone have any thoughts about this?
Aboard Aquarius Locked Down in Phuket