Partial Hospitalization, also known as "PHP" or Day Treatment, is a type of drug and alcohol treatment facility that works to treat substance abuse problems and psychological disorders which might be co-occurring. In a PHP center, the individual in treatment takes part in a variety of rehabilitation activities and methods during the day and then returns home in the evening. This is carried out anywhere from five to seven days a week, depending on the significance of the drug or alcohol problem. Partial Hospitalization can be most effective for addicted persons in Serena who who may be unable to cover the costs of long-term inpatient treatment, or who are unable to be away from their home and work for extended periods of time. While in Day Treatment, individuals participate in standard treatment services for addiction problems while also dealing with psychological issues which may deter them from remaining abstinent after rehab is done.