A friend of mine that is a good professional in this business named Eric, has a couple of sayings that may help people with their decisions on their pool maintenance.  First we all know that filtration is the key to many problems.  He tells his customers that the money that it cost to run your filter pump 24 hours a day will outweigh the cost of chemicals if run too little.  Very true.  The other fits when someone wants to take care of their own pool or spa or lets someone with limited knowledge do the job for them.  Your eyeballs are in the same water as your butt.  Very important to make sure it is properly sanitized and done right.  Think about that for a while.  Fecal matter can lead to E-Coli.