Answer:

First, get as much large debris and sediment as you can out manualy, including tadpoles. You may also need to scrub the walls and floors to destroy stubborn algae and other growth. You can also vacuum, but make sure you vacuum to waste so it does not recirculate it back into the pool. The next step will be to balance the water for hardness, total alkalinity and pH. Once the balance is acheived then you are ready to add chlorine, following the dosage chart provided on the chemicals. You will need to shock the pool first to establish a chlorine level, then keep it going with whatever chlorine you will use. Again, test and balance to make sure you have acheived the proper levels. Then if algae persists, you may want to consider the addition of a algaecide specifically for algae removal as long term algae can be stubborn and even chlorine resistant. Going through these steps, the tadpoles will be gone at one point or another. Do try to minimize the number of them that end up in the filter and equipment.