Yes, I know your not exposing the ice to the
nutrient solution at this point. Your putting the water in plastic bottles and freezing it, so when the water in the bottles melts it stays in the plastic bottles. I'm just saying when the plants get bigger and start drinking more water and you start having to replace that water volume the plants are drinking with more water. Instead of replacing that water volume with water, you can replace that water volume with ice instead. Thus, not use the plastic bottles.