Spa filters are one of the most important parts of the spa, although they are generally forgotten about. It is very important to change your filter on a regular basis, because that is what keeps bacteria, dirt, bugs, and all other kinds of nasty things out of your spa. The spa circulates all of the water through the filter to trap these contaminates. How often you change your filter depends on the type of filter you use, but normally you should replace it every year or two. Below are the three types of filters you can buy, however you should check with the manufacturer as to what type of filter they recommend you should use with your particular spa.
The most common type of spa filter is the sand filter. As the name suggests, this type of filter uses a specific type of sand (and gravel) to remove contaminate particles from your water. The only problem with a sand filter is that it will not remove all particles on its own. To help, you have to add something to the water to cause the smallest particles to clump together into bigger particles, thereby allowing the filter to remove them. You should also note that the sand in the filter should be replenished every few years of...