I've got a standard water
filter on my freshwater system, the water
goes from the tank to the filter, from the filter to the pump, from the pump to an accumulator tank. Everything but the hose and tanks
are 6-12 months old.
was plumbed so that the water came from the ocean, through a sea strainer, then a 20 micron filter, then there is a valve where I can put fresh water or the 20 micron filtered salt water
to the unit, which had a 5 micron before the pump.
My intention was to relocate the 5 micron filter to put it next to the 20 micron for easier servicing (and not getting salt water
all over the motor/pump/etc since it's all together).
When I pulled the 5 micron unit out it had large flakes of green stuff in it. I call it algae but I may be mistaken. I usually see the same crap in my freshwater filter. So I pulled the fresh water filter and sure enough it had some of the same stuff in it.
I had last replaced the freshwater filter 2 months ago, and was scheduled to replace it next month. I have regularly seen these green flakes as well as algae growing on the filter in the past. Right before we left to go cruising I cleaned the freshwater filter with bleach, and inspected both tanks
but the water in the tanks is clean (as are the tanks, both stainless steel).
Normally I use the watermaker
every 1-3 days without flushing
it. When in a marina I flush it with fresh water, and wash the filters and dry them in the sun for UV cleaning
So here's my questions:
1) I assume the green flakes in the 5 micron filter housing were from my freshwater? The flakes were fairly large, unless they grow in there I don't see how they could have gotten past the 20 micron coming from the ocean. I didn't take a picture but they were the size of fish food
(for aquariums, larger pieces)
2) I decided to move the freshwater flush valve for the watermaker to in front of the 20 micron filter, so when I flush it will remove the saltwater from both filters, as well as filter the fresh water in case any of this algae is getting past the primary water filter.
3) Is it normal to get algae in the water filter housing? Should I be cleaning
this once a month? Should I be adding bleach to my water tanks? One tank is plumbed to the water maker, the other is not. When I load up with marina water I filter it with carbon so any chlorine is removed. The primary water filter is carbon as well. It blows through a lot of water when I re-prime the filter and remove all the air from the system, so I would only do it with a marina where I could refill the tanks before heading out.