"Water chiller". It is not necessary as there is plenty of other methods to cool down ur container and im gonna start buy keeping the room temperature at the range needed for the container or if its too hot add ice coolers in the water or simply place the container on the ground that way the ground is gonna be cooling it off keeping it always cooler than the room temp.
Chiller for DWC is necessary equipment! It's not recommended to keep your grow room at below 25 or above 30 degrees Celsius. No matter what you do, with in 24 hours your reservoir will get close to your room temperature. And that is more than enough for algae to start forming. To prevent algae, you need to keep reservoir at 18-19 degrees Celsius. Bags with ice, is not the way. it might work for the firs month, soon after, there will be no space for you bags. And do you really want to replace this bags 3+ times a day?
"Nutrient concentration". As far as my research any nutrient which in NOT organic would do the job. Organic nutes will build up bacteria that might cause root rot. And the other important thing is u need nitrogen in the form of Nitric, NOT urea as urea is organic which releases ammoniacal over time and then u need bacteria which is found in the soil to turn the ammoniacal into nitrate for the plants to absorb it.
A actually meant "the nutrient concentration and pH monitor" I think that's how I wrote it. Anyway, this tool usually dose 3 jobs, monitors the pH, EC, a reservoir temperature, and it's very important. From changes of this 3 units expert will know exactly what plant needs.
"pH down" are made our of sulfuric acid. So instead of paying crazy money for Hydro pH down got at the nearby DIY store and get urself Sulfuric acid, then mix it 10:1 with RO / DI water and u have ur high quality pH down. Test it separately a few drops could drastically drop ur pH. (be careful concentrated sulfuric acid burns badly so always use safety gloves)
"water filtration system" what u talking about? Filtering the tap water before adding it to the container?
Not necessary. But would be nice. He can use mineral/salt free DI water from the general store for less than 50p per gallon. With reading of 6ppm. He need to change the water every 4-5 days that's 3 pounds a week.
It's necessary, for filtering solid contamination from air pump and root mass, and precipitations from incorrect nutrient ratio.
As well as it will always keep your water running, which is good for even nutrient distribution through the reservoir.
