Quote:
Originally Posted by
mauler http:///t/397664/converting-freshwater-tank-to-salt/80#post_3545528
Alright what would be a good sized pump or how many gallons a minute should I like
The rule of thumb is 5-10 times the tank volume/hour. When you shop for pumps you will see a false number of gallons/hour on the box, and a graph or table that gives the true gallons/hour depending on the height the water has to be raised. A common height is 5 feet, so look for a pump that delivers 1300-2000 gph at a head of 5 feet, for example (assuming your tank is 135 gallons). In reality, the calculation is a little more complex, since any turns in the tubing introduces additional resistance, so I generally oversize the pump a little and have a gall valve on the output side so I can adjust the flow rate to what I need. As a personal example, I am currently plumbing a 220 gallon tank to a sump in the basement, with a rise of about 15 feet. I will be using a pump rated at 2500-3000 gph at 16 feet. The pump is actually capable of more output, but I will throttle it with a ball valve.