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Coco pH won't drop

Hi, I have some autos growing in bat tropic Coco mix in 8litre fabric pots, being fed the full line from bio bizz, and in accordance with there feeding chart, every second watering (currently around every 6 days), the plants are 42 days old. the leaves are yellowing bottom up with clear signs of cal mag deficiency( even tho I've been adding 1ml calmag per L) this in turn made me check my Coco pH and its a whopping 8!!!!! I've tried flushing each 8l pot with 16 litres of ph'd water (5.8) and soil pH isn't dropping. Any help would be great, I will try to upload some pics later but can't do it through phone. Many thanks

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