Discharge driven automatic pool cleaners connect to your pump’s discharge. Instead of sucking the dirt up, these units use the water from your pump’s discharge to push the dirt & debris off the floor of your pool and through a filter mounted inside the cleaner.
Discharge driven units are less expensive than electrically driven units. You can usually find them for $50 – $150, and sometimes less on internet sites like eBay.
However, discharge driven units are less convenient because they require that you connect a long hose to your pool’s pump discharge. Long hoses like this can be difficult to store, they can get tangled while the unit is operation, and you must also find & install fittings to adapt the cleaner’s hoses to Intex pump fittings.
Discharge driven units may also push the dirt & debris away from the vacuum rather than through the filter. If this happens, they just stir the dirt up rather than cleaning it up.