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1000W Spider LED Grow Light Full Spectrum Commercial 8Bar for Indoor Hydroponics

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Ph going up in res

I'm having trouble with my res its 220 litre the ph keeps going up I set at 5.8 the next day its 6.3 or more an goes up more the next day I have a water pump an air pump in there iv taken the air stone off the air pump but still doing it any ideas for help please thanks

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