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Potassium Hydroxide (KOH) also known as lye, is ideal for pH adjustments. It's beneficial, safe, and easy to use.

Did you get two dual 315s? If you were buying two fixtures and the retailer would only allow one color you could just get one of each and switch a bulb when you get them. This is old so I assume you've already gotten them. I too wish to switch to two 630s over a 4x8 and am wondering what the...

Using diluted sulphuric acid properly to adjust water pH will not cause "sulphate buildup". Plants use sulphur, it's a necessary nutrient.

In America common automotive 5.77 liters of battery acid is available at any local auto parts store for around $26. It's a 33.5% concentration so roughly $14/liter. Both the 98% H2SO4 and 85% food grade phosphoric are $27.12/quart online from Duda.

This is true, but sulphuric is so much less expensive, readily available, and plants also use sulphur. Honestly, the amounts we're talking about are trivial if not completely inconsequential... unless you're doing something wrong. So the choice of which acid really dilutes down to what one can...

I'm amazed by the ignorance of so many. It's the real thing.

What do you do to those "5th day" buds before packing your column in the way of anatomization? Cram 'em in whole? Scissors?

I saw his reply and then asked another, different question. He said two would be adequate. He didn't say which two or that either are optimal. I'm aware of light burn/stress. Currently right around 28,000 lux at the closest plant top.

I initially had just 2 hps, and wasn't achieving the compact, dense buds these strains are purported to produce so I moved them apart and put the 1k mh in between to add blue. I also think I may have too much light. What do you think would be "optimal" for a 4x8?

I guess I'm still missing something... Doesn't heating the column default the purpose of freezing your material and solvent? You have a source of 150° water plumbed to the drain port of your dewaxing sleeve? How do you have any pressure in a - 50° solvent tank? Do you rely on vacuum and recovery...

Hot as the tap makes, Probably 125° or so. Is emptying the sleeve necessary on a bidirectional system with active recovery?

When we used water to melt the dry ice slurry the water just froze...solid.

So you add water to alcohol/DI. What do you do with it after this? Waste?

So this setup uses the bottom-fill overflow as the top-fill by turning valves? The BVV one pictured earlier uses separate top fill and overflow hoses. Which is better and why?

How do you get the DI slurry out of the sleeve while still attached?

THE SCENARIO VEG ROOM - 24 hrs of light 4 mothers in 5 gallon pots of soil under 8 4' T5's. 2 - 28 site cloners under 1 2' T12 plant light 1 - 16 pot ebb & flow table under 1 250w CFL using Growstone and Hydroton mixed 3 to 1 respectively FLOWERING ROOM - 12hrs of light 1 - 4' x 8' ebb &...

My understanding of recovery machines leads me to believe that as long as you pressure test your system before each use to ensure that your pumps seals are intact and that there are no leaks, a sparkless model would be unnecessary, but rather a safety precaution. I haven't found any other...

In what way, precisely? Can you elaborate some? Thanks.

Does dewaxing have to take place in a separate column? My material column has a dewaxing sleeve around it, it's only 1.5" diameter. My current understanding (thanks GW) is: 1) Flood from below with - 20°F solvent (and up through the return hose to the collection vessel) one columns worth 2)...

Even if the collection vessel is in DI?