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Those are impressive for T8s. Do you position all of the lights above the plants? What can you say about the density of the flowers? Do they get really fluffy near the bottom of the plant?

If you heat a container of water, it will evaporate fairly quickly. If you use a fan blowing across the waters surface, it will speed it up even more.

I'd use hydrogen peroxide rather than bleach. If your stone is a micro-pore diffuser, than you can use muriatic acid to clean it.

ROFL, am i the only one that caught this!?!?

Have you changed your membrane lately? I don't think it should even be that high.

I never said he's wrong. I actually think that there may be some merit to this and I don't believe it's been properly investigated to throw it out so quickly.

I've heard that some RO filters have to go through a "break-in" period before they will produce low ppm water.

CO is produced when gas is burned without the correct concentration of O2

Pressure fed automatic watering system.

Blue T5HO lighting tends to keep internode spacing at a minimum when properly spaced. Excess heat can trigger elongation.

I don't like being tied to a watering schedule. I like DWC. Simple and effective. Once dialed in, it's reasonably unattended for 2-4 days.

I don't know why anybody would want to fuck with that when you can get a decent ATC meter for $130. Most of us deal with temperature fluctuations.

I thought about that, but it occurred to me that grow rooms are far more likely to be negative pressure environments than positive pressure. I feel it is unlikely that your grow room will cause a back draft.

Temperature Compensation for pH Meters

bubble cloner?

I agree that this is a reasonably safe endeavor for anybody with any basic DIY skill. I also agree that there is some amount of danger that you've not mentioned nor suggested safeguards against. It is true that CO2 is the primary byproduct of burning propane and natural gas when burned cleanly...

Ahh, but you do need them to read temperature. That's how they compensate to provide accurate readings. Otherwise, you'll have to do the math every time.

in hydro? r u saying that you're using 25oz of solution in a hydro system? If so, that's your problem. Strive for 5 gallons of nutrient solution per full grown plant in most systems. Undersized reservoirs are difficult to maintain.

It is true that you would be well off to try a different line of nutrients. For simplicity, you can use a single step fert, like GH floranova. Or, you can try a "mix your own" style like their GH flora 3 part line. You can also spend a lot of money on higher end nutes and supplements, but...

I signed up on greenpassion, but quit visiting because every time i open a new tab, it logs me off and wants me to sign in again. Fuck That.