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lets see a pic, but if u got them in net pots an can lift them easy way to work out is weight a net pot dry an wet drain an wait just before gets dry then u know. room temp an humidity an size of the plants will play a big part in this so there is never a perfect answer

how much are u feeding them now per litre? Also what are you spraying them with?

2.0 ec reading there is something wrong with your RO system or your EC metre. should read 0 or very close to that

yeah looking like Calcium but also slight nutes burn on tips too

on there way now :) what ppm are you on now an whats your room temp?

in uk they say DIY install on them so you know they are pre gassed. an yes are about £200 more put i have messed one mine up once in moving it, i re charged lines myself an cost me near £150 to buy the R401a Gas so really u would be giving the HAVC guy that cash for installing it anyway so not...

very nice, those 20 will be plenty for that room if u veg for 6 weeks.

you be fine 1000w isn't that much only 5amps some people have 6/8 1000w lights an as long as u pay the bill company are not bothered all profit at the end of the day.

they are great like u say as don't need havc guy coming charging your lines well as long as the lines are shorter than 6m as they come pre charged. ive set a few up now an love them, wouldn't grow with out them now

also look up blue lab combo metre as its they same only hasn't got the alarm an runs of batteries an i think they are £50 cheaper, only difference is you would have to press the on button when wanted to look at the reading

Blue lab one is the daddie no complaints works as should!

ill follow this one too, like to see others use AN base nutrients.

must be a old system then as all new ones u get two boxes one on the brain an one u fit to the wall with a dial on.

need fresh air being pulled through the hoods an back outside again, an even this if you live in a warm cilmate still might not be enough 600w lights are a lot easy to control the heat, if can't get fresh air through those hoods 600w could be the way to go!

check there site there is TWO system one where have airstone in each bucket with only one timer with NO! dial. other with a dial an smaller buckets

you havent got the flood an drain brain u have the bubbler style system from IWS

If they are growing just let them grow. 300ppm is more than enough. For small plant/cutting

Also I said don't worry about PH to much if using AN PH perfect base nutes. I know I couldn't deal with it my self always wanted to PH it back down. But even at PH 6.4 plants grow fine.

Use RO Water too? As said when would go up to 6.3/6.4 for day or two then drop back down. I have digital ppm500 meter an everyday the ppm go down by 10/20 each day. Also the amount of water / nutrient solution is also dropping a lot each day too. Just have find that happy medium...

no updates on this grow?