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Hi, I've started to have some deficiencies with my plants, I'm actually in a flood and drain iws system so flooding from the bottom of the pots and then returning to the feed tank. My question is, I've pulled one sick plant out of the pot and tested runoff, ph is 5.8 going in and coming out at 6.1 so I'm assuming the ph is fine. Next I tested the runoff off EC. EC going in is my tap water at 0.5ec and coming out is 1.6ec. Now I'm assuming with the runoff EC coming out so high that might be the problem. Can anyone let me know what's the best way to flush in this system as the plants are huge so it would be a nightmare flushing from the top of the pots. Is this still classed as flushing? Filling up the res with plain tap water which is 0.5EC and ph at 5.8 and flooding the system. I remembered people saying to never flush with just water in coco but with the EC being so high and its a returning flood and drain the EC keeps going up after a flood when it's returned back to the res. Would you now dump this water in the res or keep flooding with the same water? Any help would be highly appreciated I'm just stuck on this flushing topic with me being in a flood and drain iws system. Thanks