If you have a saltwater system model that can be controlled remotely via an app, you can program a different saltwater system operation for each day. Saltwater system models without a wifi app cannot be programmed this way. You can only select the length of the operation time and the saltwater system will turn itself back on at the same time every day. The filtration also needs to be adjusted to this, without filtration the saltwater system will not work. Technically, it is possible to use a timer. However, INTEX does not offer any timers and cannot be held responsible for the suitability of timers from other manufacturers.