Out of the box your Rainman System can begin to desalinate sea water in to fresh, clean drinking water, in fact, if you have no plans to cruise up into Brackish or Fresh Water to use your desalinator - nothing further is required to operate your system - you have everything you need with the base system to fill your tanks with fresh, clean drinking water.
Now if you are planning to use your system in Brackish or Fresh Water - you will simply need to add (and this can easily be installed at any time) a small gauge that will tell you exactly how much water your system is producing in 'real time'.
When you move into brackish or fresh water (of which your seawater RO membranes are perfectly capable of handling) - there is a significantly lower salinity level in any given amount of water - which means more pure water molecules are present..... if we were to use the same high pressure to force this water across the membranes TOO MANY pure water molecules will be trying to pass through the membrane at any given time.... which is a bad thing - and ultimately will result in the demise of your membrane....
So, we simply regulate the pressure when we are in brackish or fresh water, to ensure a manageable amount of water crosses the membranes at any given time, thus ensuring that this flow does not exceed the maximum rating of the membrane.
This is where the brackish water flow gauge comes in - once installed - we simply increase the pressure until the flow gauge reaches the maximum output rated for your membranes (in the case of the high output membranes 37GPH/140LPH) Once the needle reaches this point (as you can easily see from the above illustration), you simply stop increasing the pressure - you are now free to fill you tanks without a worry, wherever your voyage takes you.
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