REFILLING AN OUTDOOR INGROUND POOL?

I drained my swimming pool because i was told that it has to be done every 4 years and I have had it for 8 and never done it. I have already drained it and now that it is full again it is extremely green and i tested it the chlorine levels are really high but I haven’t put more than 2 tablets in? Are there any chemicals or steps I Have to take after refilling an outdoor concrete pool?

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