Can I add hydroguard at anytime to the water in my Grobo
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Yes. The only suggested thing is to add AFTER Grobo dispenses nutes after a drain/fill.
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I’ve used it prior to nutrients with no issues 
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The reason I bring that up is if it effects the EC, it can stop nutes from dispensing…I had this issue for other reasons. So on a water change, it’s best to wait till 3,4 and 5 dispense before adding anything else to the res.
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I only add two milliliters maybe that’s why I’m using a minimal amount enough to keep the roots happy but not enough to mess with the EC
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I use 3 teas hydroguard at drain and fill with no problems! 
To be honest @FireGuy its not going to matter if you wait because if its off, the nutrients will just disperse again after hydroguard is added to level out if its off!
Its not a dispense once and do fine kinda thing it constantly regulates!
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