Swimming Pool and Spa water maintenance is a science.  That's why you should take the time to research what your local climate means to your pool and/or spa.   Shady -vs- Sunny, Humid -vs- Arid/Dry, frequent rain all play a part in the upkeep of your water.  Always test your water weekly and always follow directions as specified on the product container.

Factors in Water Treatment:

Physical Factors (filtration and circulation)

Biological Factors (disinfection and algae control)

Product Manuals, Troubleshooting and Frequently Asked Questions
Some of these links require Adobe Acrobat. You can download a free copy HERE

Swimming Pool FAQ
Spa Hottub FAQ

Pool Water Troubleshooting
Spa Water Troubleshooting

GLB Pool Guide
Rendezvous Spa Guide
LeisureTime Spa Guide
Jack's Magic Pool Stain Removal Guide

Nature 2 Spa Purifier Cartridge
Winterizing Your Swimming Pool
Using The Omni Synergy System

Articles:

Phosphates in Pool Water

Cleaning Filters when Using Baquacil

Fall Closing for the Pool

Pool Frog - Great Value

Pool Basics:

Calculate the Volume of your Pool

Pool and Spa Checklist (Printer Friendly)