king_of_nothing
- 19
- 3
Go with dry ferts. I use mega crop 2 part, there are also tons of other that are well proven like jacks 321. If you wanna cut the cost then cut the water.Hey guys,
I am currently in the middle of engineering a some what large RDWC system for a first growers adventure and I want to make grateful use of all of the existing information on the web on the matter.
So I was calculating the upkeep and I got pretty concerned with the nutrition requirements for a RDWC. But perhaps my reasoning is off somewhere.
This post is actually a deep copy from another post of mine in a different thread (link here) on thcfarmer.
So I am thinking of two 1200 L (317 US G) RDWC installations for flowering. and one 700 L (185 US G) set up for vegetative. I got the airflow and waterflow and water temperature covered. So for my own system as starters I was thinking of using the General Hydroponics Flora trio nutrition solution to keep things simple and maybe later mix my own micro/macro solutions. However if I am looking at GH's flora's suggested feeding schedule for recirculating systems (link here) you need in the order of 20 ml / Gallon in res of averaged nutrition solution a week. So that translate to (2*317+185) * 20ml /G ≈ 16.4L of nutrition product every week! In my own euro country, I can buy this stuff at about 17.50 euro a litre. So this would mean that I require roughly 290 euro's worth of nutrition every week. Which feels like a lot! Sure, I can try to buy this stuff in bulk overseas to get it more cheaper. But even if I could get it at half the price, it still feels very expensive.
Is my reasoning very wrong here or are other RDWC growers also adding roughly 20 ml of pretty expensive stuff for each Gallon in there system as well?
Thanks people!
I just ran my first RWDWC grow using GH 3 part, and because of how efficient my system is, I couldnt even run above 400-500 PPM (500 scale) in late flowering, and I have high powered LM301H quantum boards too for the difference that makes. I literally ran there suggestions at about 25-35% on their feed chart. So keep that in mind, too. Compared to when I did 5 gallon DWC buckets and could get away with ~1000 PPM, I cant do that with the RWDWC.
Also, I know buying the GH nutrients by the gallon is A LOT cheaper then buying the little quart or 32 oz bottles...whatever the size is, lol. A gallon is usually only like twice as expensive as a liter bottle, but 4 times as much. Worth looking into, idk about your location though :(
Def look into dry nutes too - im kinda getting bored/tired with mixing all these nutes and additives and would like to maybe try something simpler eventually.
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