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When teeing into an existing seawater supply, we recommend installing a separate seacock or valve
(in addition to the one at the thru-hull) to independently control the supply to the watermaker.

5. Install Reject Brine Plumbing:

The reject brine water can be teed into an existing scupper

or sink drain hose for draining overboard. Use the 3/8" reinforced hose and supplied hose clamps.
A tee of the correct size will have to be supplied. Alternatively, a dedicated thru-hull may be installed
at a convenient location. In this case, we recommend that a seacock be installed at the thru-hull.

6. Install Product Freshwater Plumbing:

Your product freshwater plumbing design should

allow for both saving and discarding of product freshwater. This normally requires (1) a drain
location and (2) a container for collecting good product freshwater.
In no case should the product freshwater hose be permanently plumbed into the ship’s potable water
storage tank(s), without providing a way to reject the product freshwater when necessary. Note that
product freshwater should

always

be rejected during the first few minutes after startup, and

especially after treating with membrane preservative or chemical cleaners. For that reason alone, a
means must be provided for disposing of unwanted product freshwater.
In general, we do not recommend that the output of product freshwater be routed directly into a
vessel’s freshwater storage tank(s). If for any reason the watermaker should fail during operation,
there is a good chance that the entire supply of freshwater in the storage tank could become
contaminated by unpurified seawater. This is especially important if:



you have only a single tank for storing potable water.



you will be making extended offshore passages and depending on your watermaker
for your potable water supply.

The preferred method for collecting product freshwater is to use portable 5- or 6-gallon jerry jugs or
a separate “day tank,” which is isolated from the main storage tank. Some method should be de-
vised for testing the product freshwater quality at the beginning

and at the end

of each operation.

When you are certain that the quality of the collected product freshwater is acceptable, it can be
transferred to the main storage tank.

Note:

The important concept is to always have a minimum quantity of known-good potable

water available at all times, either in your main storage tank or in the collection container(s). The
length of your expected voyage and maximum distance from a source of potable water will
determine the size of the adequate minimum amount. Arrange your water making schedule to
assure that you always have the minimum of known-good potable water on board in one or both
of your containers.

To route the product freshwater output of their watermakers, many users simply run a single 3/16"
I.D. hose directly from the output hose barb on the membrane housing to a single location, where the
water is tested and either discarded or run into a collection container.
Should you prefer to have your product freshwater output routed to two separate locations for test-
ing/discarding and collection, the watermaker system includes a product 3-way valve for use in your
output plumbing. Refer to

Figure A-1

for a routing diagram.