If your pool is not very large, and the area that is watered, the possible variant of the organization of the flowing system of water exchange. Watercourses virtually no blossom and therefore will not be any algae on the surface or on the walls. It is enough to ensure regular change of only 0.5% of the water from the pool surface, which can be used for the irrigation area. But of course, this is not to use chlorine and other chemicals for disinfection.
To implement this method will have to apply engineering thought, since service firms do not offer ready-made solutions. Ideas for implementation you can see here: http://delaysam.ru/dachastroy/dachastroy20.html
The classical organization of the pool be sure to install the filtration unit, which can purify all the water. Carefully follow the filter element in time and change or rinse the sand in it.
Choose a filter based on the volume of the pool. The filter should pass the entire volume of water in the pool for four hours. To do this, pay attention to performance, which must be indicated on the packaging.
The cheapest method of disinfection of pool water chlorination. To reduce the concentration of chlorine use additional equipment: ozone generators, UV lamps, ionizers.
During a low contamination of the walls is enough to bring a double dose of cleansing and denipitiya agents. When more visible is to use an underwater vacuum cleaner. If these two methods do not give the desired result, is to drain and physically clean the walls with a brush and cleaning products.
Install skimmer device for collecting large dirt with the outer layer of the water. Usually vacuum cleaner for swimming pools connected to the nozzle water intake or skimmer.
To clean pool purchase own vacuum cleaner. In addition to hand held vacuum cleaners are automatic machines. This vacuum cleaner robots, which move along the bottom (and some on the walls) basin for a given program or through a remote control.