Replaced my existing sand filter with the cartridge filter system.
Built-in one way valve preventing water entering from wrong direction.
Running now for couple of days, filtering much better than old sand filter. Always had fine dust like particles at bottom of the pool, totally removed by new filter.
Happy with performance so far.
Its great, our dogs love it. I suggest you highlight that the filter needs to be changes around every two weeks and you offer addition filters to be purchased. After reading the instructions I realized I needed to buy additional filters which I bought from Takealot.