undercurrent turnover rate

Discussion in 'Hydroponics / Aeroponics' started by oakley1984, Dec 31, 2017.

  1.  
    oakley1984

    oakley1984 Well-Known Member

    just starting to piece together a new undercurrent system, it will be 8x 13g buckets with a 13g epicenter, so when running should be around 70g of water volume....

    would anyone be able to provide some insight on waterpump sizing? turnover rate? im *thinking* im looking for around 10x an hour turnover rate (so 700gph pump)

    thoughts? corrections? comments?
     
  2.  
    Airwalker16

    Airwalker16 Well-Known Member

    Sounds like you already have your answer.
     
  3.  
    oakley1984

    oakley1984 Well-Known Member

    lol yeah, sounds like.... im just making an educated guess as no actual solid info can be found, eg, pump flow rate vs volume of system, water chiller sizing (room temp, water temp, desired temp)

    right now looking at 700gph pump, 1/4hp water chiller, and a 110lpm air pump

    fairly sure that is all accurately sized, thing im really questioning the most, is water chiller, 1/4 hp, or 1/2hp
     
  4.  
    firsttimeARE

    firsttimeARE Well-Known Member

    What are you using for netpots? I say this cause with 6" netpot lids my 12gal totes fit 6gal which would put you around yeah prolly 70gal 1/4HP would do it. I oversized mine so it runs for less time.
     
  5.  
    Airwalker16

    Airwalker16 Well-Known Member

    If you got the money, A bigger chiller is better option
     
  6.  
    FennarioMike

    FennarioMike Well-Known Member

    Mine Undercurrent system is a 6 plant, gallon and it came with a 350gal/hr motor for a total 56 gal capacity. Which made a turn over rate of 6x/hr. If you go to 10/hr make sure you dial back the nutes a bunch or they'll get nute burn.
    I'm thinking that anything over 400 gal/hr will get you right on the money with their turnover rate. I find their feed charts to be a very good starting point.
     
  7.  
    firsttimeARE

    firsttimeARE Well-Known Member

    I'm using a 550gph for a 45-50gal setup. Works fine.
     
  8.  
    Lordhooha

    Lordhooha Well-Known Member

    I use a 900 gph danner pump for all mine
     
  9.  
    JSB99

    JSB99 Well-Known Member

    12 cycles/hr (unofficially) qualifies as UC, from what I've gathered from research..
     
  10.  
    JSB99

    JSB99 Well-Known Member

    How did you come up with 70-gallons? Even if you only fill your buckets with 10-gallons each, that still amounts to 90-gallons. I would go with at least 1000gph. Are you planning on using airstones, and/or a waterfall? If you're not planning on using airstones, you'll probably to over-compensate and go more than 1000gph, to make sure there's enough flow to get DO to the center roots.
     
  11.  
    oakley1984

    oakley1984 Well-Known Member


    how did i come up with 70g? by knowing the dimension of my buckets, and what the approx water level would be by using a 10" netpot

    roughly equates to ~60% full based off bottom of netpot and waterline either just touching, or barely below netpot

    9x13g = 117g x 0.6 = 70.2g

    and yes ill be using airstones, and a 110lpm air pump.

    and how do you get 10gallons from a 13gallon bucket? you would have to be running the water level so high in the system, that first off, you'll end up killing the plant by having 100% of the rootmass submerged, as well as, if there is the slightest problem with flow, you would end up overflowing the buckets and flooding your room? 10g in a 13g bucket is neither feasible or logical? and i based my flow rate of ~750gph to achieve approx a 10x per hour turnover rate
     
    JSB99 and Cold$moke like this.
  12.  
    oakley1984

    oakley1984 Well-Known Member

    also, undercurrent never stops flowing, it is not a metered drip system. its a re circulation system, interrupting re circulation will only make for slower growth rate?
     
  13.  
    oakley1984

    oakley1984 Well-Known Member

    agreed, will go with the single 1/4hp unit for now, if more capacity is needed i can add a 2nd 1/4hp unit daisy chained to first unit, cheaper than i can find a 1/2hp one
     
  14.  
    oakley1984

    oakley1984 Well-Known Member

    interesting, wouldnt of thought that a higher turnover rate would attribute to nute burn, but i will deff be keeping an eye on that now
     
  15.  
    oakley1984

    oakley1984 Well-Known Member

    that info is irrelevant without knowing how many sites, bucket size and total volume of system!
     
  16.  
    oakley1984

    oakley1984 Well-Known Member

    ty for the feedback, seems right in line with the 10x an hr rate i was presuming!
     
  17.  
    oakley1984

    oakley1984 Well-Known Member

    ill be using 10" netpots in 13g EZ-stor buckets
     
  18.  
    Cold$moke

    Cold$moke Well-Known Member

    Im using a 900 gph pump for 30 gals lmao
    4 10 gal brutes and a brain bucket.
    I have been told its a wee bit oversized but i wanted good flow

    Its not too violent or anything in my setup as i was trying to make a system that hopefully used less water...

    But i have the same setup basically but with 5 gallon buckets and a 400gph seems to be working fine

    Although i would say using big totes allows for more surface area for waterfall aeration that the roots wont block like a 5 gal bucket would
     
  19.  
    Cold$moke

    Cold$moke Well-Known Member

    :clap:

    10g in a 13 g bucket will distort like a mofo lol
     
  20.  
    oakley1984

    oakley1984 Well-Known Member

    lol ikr?

    Im basing my turnover/flow rate off of my extensive experience with aquariums, ideally 10x/hr will have the highest oxygenation rate, at ~5x an hr, it is sufficent but become susceptible to anaerobic conditions. at 15x or higher turnover, your oxygenation rate does not increase... but high flow creates its own issues of possibility of being damaging to livestock, as welll has creating current channels which creates dead zones within the tank that basically become/remain stagnant... which in turn also creates the possibility of anaerobic pockets within the tank... figured it was a good basis to start from as those numbers apply to planted aquariums as well, dont see shit growing in white water rapids right lol
     
    Cold$moke likes this.

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