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If your going to use tap water with bennies find out whats in it. Get a water report from your municipality. Then go from there. But no, don't mix city water and great white. - Jiji

Sheet vinyl is cheap, goes down fast and is water proof. I got a antimicrobial commercial grade. Loose lay, maintenance free, and easy to clean. If you have a wood subfloor already, its what I would do. I'm sure it will last longer than I plan on growing in that room. - Jiji

Are they the same model fan? What are the models of fan you used? - Jiji

Yes, Yes, Yes (most likely anyways). They aren't good setups. You can use gavitas fine on 8 or 8.5 ceilings, but not if your going to use tables which in general have to be off the ground quite a bit. - Jiji And forget about putting gavitas on light rails and tables without a friggin tall...

You don't have to worry about cavitation as no water is involved. It will work fine. - Jiji

Many people are still on the ride in the U.P. :) - Jiji

Ummm No. I've seen you been giving a fair amount of water advice and been completely wrong. To the OP, don't sweat the chlorine. In the US, the EPA requires your municipality to send you an annual water report. Theres plenty of guidelines. And if you haven't seen one, call them up. Asking...

Meh, it depends on what you want. Setting up a NFT to your goals is going to be a trial and error thing. But yeah, I would only recommend it if you plan on growing smaller plants. Back in the day I had some pretty good results with it (considering small plants.) There's pros and cons to...

Never heard of them. Don't get hung up on marketing. - Jiji

Buy a ballast thats UL listed. Gavitas are, and its no secret I love them. - Jiji

Well actually my room was a bit smaller now that I think about it, with 4k. I've come to the conclusion if you want to grow in MI year round, and do it right get prepared to spend serious money. I used to run a 4k setup in a garage sealed, but my mini split would only operate down until around...

I've used just a 70pint Chinese dehumidifier in a decently insulated garage that was sealed. No other heater, down to -30 temps. Are you using duct dampers? - Jiji

Thanks all, I ended up meeting Ben at the cup. The strains I had tested were nothing to write home about, but interesting. I'm wishing I had that Perkins Cannatonic cut. - Jiji

Yields are good. I like Gavitas a lot but like I said, they are not magic. Maybe a 5% to 15% increase in ppfd than your standard single ended digital with mismatched brand bulb. To me thats a big deal. Depends on what you want. Maybe 4 is enough for you. Meh, I could spend a long time...

fire - Jiji

Most attics that are older are poorly designed (in my area any ways.) Then you force them to do something they were never designed for and its much worse. The problem isn't so much venting in summer, its venting in winter. The warm moist grow room air, meets cold air and objects that are below...

Well, its hard to say without seeing it. I guess if you just cant, you could run new lines and use those instead , or maybe try using an air compressor to clean out lines. - Jiji

Pre-made trellis, 2x2, stapler - Jiji

Why can't you take the tubing apart? - Jiji

If you use the insulated ductwork it will just move the condensation location to the reflectors. If you have a somewhat constant intake temp, your exhaust fan should work nicely. - Jiji