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Rockwool saturates easily. 6" blocks saturate & STAY saturated unless there's a large, thirsty plant in 'em. Overwatering problems are almost a sure thing when 6" RW blocks are used as the primary (cloning) medium. 6" blocks are intended to be used as a secondary medium- you clone in 40mm (1.5")...

Sweet Tooth No. 4 from Spice of Life. Probably no longer available from SoL. Still running plants which were sprouted from beans bought in 2002. There's other indica dominant hybrids out there which will perform similarly, eg Blockhead. Don't forget, when you are vegging plants before...

Still have never heard of the stuff. Looked them up on the web; seems H&G are miming Canna's label art & colours to give the impression that their product is like Canna's. H&G is not made by Canna & the 2 outfits have no relation to each other. H&G appear to be trying to ride Canna's coattails...

Happy to help & thanks for the thanks. :) You're not going to like me very much- I would change just about everything that you're doing. Please refer to my 'Get a Harvest Every 2 Weeks' thread as linked in my signature. Vegging clones before flowering wastes time and money. SoG produces...

All generally good, but the plants in a properly operating system will be at their final height in wk4, so trays 2, 3 & 4 can all be at the same height from the floor. My tray 1 is blocked up 50mm taller than tray 2, but it really doesn't need to be. I've only blocked that tray up in the...

My primary comment about advice from hydro shop clerks is that if their advice was worth anything, it's highly improbable that they would be writing up sales for minimum wage in a hydro shop. 'Cleaning' is a pretty weak excuse for not using multiple trays. If anything, the clerk should have...

Happy to help. I just wrote a relatively long reply on another thread which has some bearing on what we're takling about here, so I'm going to repost it here in entirety. BUdbuddysmile is asking our unmethodical, anti-scientific H2O2 leaf-sprayer what the deal was- and I reply to him:

There is no benefit to use of H2O2 in a foliar spray. Zero. Strangely enough, if someone really knows what they're talking about, they'll be able to describe extraordinarily complex phenomenae in a few simple sentences. Every single aspect of growing cannabis is well known and is describable...

Thanks. :) The biggest pitfall for would-be w33d b4R0ns is the failure to use evidence-based techniques. All too common is the ineffective and inefficient scattergun approach where lots of expensive and unproven 'magic sauce' additives are thrown at a crop, often causing problems and always...

On average, about .75oz per plant. Thanks for that, but I'm already in a wonderful place. US Republicans call it 'Australia,' and about this, we are most amused. :D You should not use water-repellent rockwool at all. The stuff makes pretty good insulation but not so hot for use as a...

Hmm, OK on the 2' T5s, but there's still no need for high light intensity for clones. SoG plant size is deliberately limited by flowering immediately after clones set root. Even with more rootzone volume, they won't get bigger. My flowering plants don't come close to filling the 3L of medium...

Quite so. However, there's no need whatsover to expose plants to sodium stannate, even in trivial amounts.

No, they're in 175mm x 175mm dia standard pots, which are about 3L. 1 US gallon is 3.78L. Make friends with the metric system! I've always used the 175mm dia x 175mm tall pots. So it happens, 24 fit tightly in a 900mm x 900mm flood tray, which prevents pots from tipping over. Would fit 25...

You, sir, are a BALDFACED liar! Screenshot of the American Elements Material Safety Data Sheet at http://www.americanelements.com/snsst.html Mate, who do you think you are, Mitt Romney? :D

Before you read the MSDS, you could reasonably say you were mistaken. Now that you HAVE seen it and continue to propagate the same falsehood, you're lying!

Okay, now you're just lying. Sodium stannate most definitely IS toxic and I have told you as much in this very thread! But don't take my word for it, refer to the MSDS from a manufacturer of the stuff (which I also have presented in this thread):

OK. Seedlings should be getting plain tap water (ph ~7), no need for pH correction, until they develop their 1st set of 'true' leaves, when they can take a weak veg nute soln, around 500ppm (EC 0.7) at 5.8. Hold them at 500ppm until they have their 3rd set of true leaves and several roots...

Hydro shops will have stronger H2O2, as will some 'health food' shops (but whatever you do, don't follow any advice given to DRINK the stuff..) and foodservice equipment suppliers, as H2O2 is an effective steriliser for food handling equipment. You might replace the water pump in your system...

Yes, I'm aware that H2O2 is restricted in strength in some localities, purportedly to prevent use in making the crude & unstable explosive TATP. In my not so humble opinion, anyone stupid enough to try to make TATP deserves to have it blow up in their face. Fortunately, 29% is still useful in...

Your experience is typical of users of high-strength H2O2. You can go to 10ml/L with 50% or 17ml/L with 29-30% for a once-off shock treatment in a particularly heavily pathogen-loaded system, returning to 1ml/L of 50% or 1.7ml/L of 29-30% going forward. Thanks. I try not to be overbearing...