UTChemE,
You can download (free)projection softwares from Filmtec, Toray and hydranautics. These softwares also contains instructions on how to use the softwares and design parameters/constraints, etc.
http://www.dow.com/liquidseps/design/software.htm
http://www.torayro.com/...
KWTPOP;
The 5 GPH is meaningless without the concentration of your polymer solution. Do you know the % concentration of your polymer solution? Usually, the dosage is based on ppm as 100% strength and then diluted to whatever concentration that best suit your application. Polymer usually (but...