Stem splitting and ice

Hi. Getting ready to finish one plant in about 4-5 days. Have been using ro water for a couple weeks now. Was reading last night about drilling a home in stem. Am I too late. Also about putting ice on it right before darkness and was wondering if I can use store ice or need to use the ro water to make my own ice to put on. Don’t want to mess up my two weeks of ro flushing. What ya think. TIA al

well… chickened out last nite on stem splitting… froze ro water in water bottles and poked holes in them and put around top of pot… intro 72 hrs darkness.

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