in my opinion mort is spot on . nice one mort here is a rough guide..........
On every single water pump, flow rate and pump head are the two most important specifications. Flow rate is how much water can be moved in time period
without any restriction. This value is usually given in gallons per hour (GPH), liters per hour (LPH). A benchmarking procedure would be simply to see how much water can be moved from one tank to another in a hour. Head is how high or hard water can be pushed
at full load. This value is usually given in feet or meters. A bench marking test would be to see high the pump can push water in a thin vertical tube.
Its always more worthwhile to have more "feet of head" in reference to a pumps capabilities. Flow rate will follow if you've got good head pressure.
Feet of Head is a measurement of pressure though.....
It takes 0.433psi to lift a column of water 1 foot. That means 3 feet of head = 1.299psi
All pumps list their pump rate but not all pumps list their head. Why? Flow rate is usually a nice big number... but is an absolutely useless value without a head value. You will never use a pump in a watercooling loop without any restriction. Waterblocks and tubing bends all create restriction. For example, a pump lists its pump rate at 1000GPH but has only 1ft of head. Any type of restriction would seriously drop the actually flow rate. If there is enough restriction, the pump may not actually move any water. While the pump can push the water very fast, it simply cannot push the water hard enough.
A easy way to think of "Head" is to think of it as pressure....Which it's not,but the higher the head the more easily a pump can can push more water through the loop
hope this helps you to understand a little better. so
GPH is gallons an hour and
LPH is Liters per Hour.
hope this gives you an idea how a pump is calculated all the best fred
i copied and pasted this from a pump site.
oh and by the way i would never think of people as dummies who want to be helped. where all here to help each other. and looking at your build so far. your good at other thing s we all have to learn sometime on differant subjects all the best fred