How to pour liquid chlorine in above ground pool?

With your parents situation it will probably be easier to drain and refill. You are not going to be able to complete the slam process long distance. Next time you go up there, drain about 75% of the pool and refill it if you can do so within 48 hours. Add enough CYA to reach 20ppm and raise the FC to shock level, check it in an hour, and raise it back to shock level if needed. You may also want to install some level of chlorine automation either with an SWG, Stenner pump, or even an inline puck feeder. Just keep in mind if you go with the puck feeder that you will need to keep an eye on the CYA level and be prepared to drain if it gets too high.
 
If you get your FC too high, it can start bleaching your liner, bleach your bathing suit, irritate your skin and eyes. I'm not sure how high you have to get it to start causing any damage. With a FC of 19, it should be burned off by the sun enough during the day that it'll fall back down to a decent level the next day, and back to your target the following day. Also, the higher your FC is, the more will get burned off by the sun. You lose roughly 1/3 of FC each day depending on CYA level.
 
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