A week from harvest and still have a high TDS

I have been flushing for a week now with Ph corrected water and have another week to go but I took a TDS reading today and I got a reading of over 1000, what are peoples thoughts on using a flushing agent?

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It can take a lot of gallons of RO or distilled to run PPMs down to 200 - 300 (my target for a flush) and a flushing agent like Sledgehammer shortens the process.

Okay I’ll look into it, thanks