If you keep all your water balances correct and run the chlorine generator unit properly keeping the Chlorine level of 1.0-3.0 PPM you should never need to shock your pool. I have heard of a few exceptions, but set up and running properly the answer is no. The Chlorine generator shocks the water with chlorine as it goes throught the chlorine generator. One reason for the exception (needing to shock the pool) is not keeping the system runing. Running the sytem 24/7 is recommended (pump and all)
Shutting the salt system and the pump down defeats the purpose of removing the algae and other contaminants. That is precisely why you elected to install the salt system in the first place. The salt system is designed to shock the pool however, it could not hurt if you add liquid chlorine occasionally especially if you are having algae problems. Running the system 24/7 is unnecessary unless you are having severe algae problems. Cleaning or backwashing the filter on a regular basis will help greatly in the removal of contaminants. A clean D E filter does not work well if it is totally plugged with dirt and debris. Also, if you are having algae problems you may not be running the system long enough 2, 4, 6 hours is not sufficient time to turn the water over. Your salt levels and conditioner levels may not be at adequate levels to be working for you. With algae you will have to superchlorinate and brush the walls and floor to keep the algae away from those surfaces - - let the filter pick up the dead algae as the chlorine kills it.
Shock is a very active chlorine that is designed to quickly attack and kill microscopic organic growth (algae). When my pool starts to become slightly cloudy and is no longer crystal clear, I know that algae is just starting to grow. When this happens, I know it's time to shock the pool. Algae grows faster in warm water. When my pool temp is 90 degrees I know it will need shock every 7 - 10 days. In the Spring and Fall when the water temp is 65 to 70 I can get by monthly. How often you shock depends on many factors. When I look at my bag, it says to shock once a week and it may have to be done more if there is rain or a lot of swimmers because of bacteria growth. You should test your pool water about 3 times a week and shock as needed.
I am not sure this will remove the algae, but after trying several products to keep the algae from accumulating in my outside fountains, I put shock that is used to clean the pool. It really kept the water clean and free of algae. Of course, you would take precautions if you have pets to insure they do not drink from them. You could try this on your concrete.
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