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Using potassium silicate in your reservoir

Discussion in 'Advanced Marijuana Cultivation' started by HotWaterKarl, Dec 1, 2017.

  1.  
    HotWaterKarl

    HotWaterKarl Well-Known Member

    Curious about using PS in your reservoir. I run ebb and flow and start with clones. Should I add the potassium silicate right in the beginning when I first put the clones on the table? And then keep adding it until week 6 of flower? This bottle I have of DNF nutes doesn't really give me any feed schedule for the stuff other than add 1/4tsp per litre.

    Also I heard it is best to mix it in a bit of warm water then add it to the reservoir first before adding your nutes. Also that it will raise PH. I also heard plants absorb it at PH 7 so I don't understand how it would be effective with my reservoir in the 5.6-6.2 range.

    - if there is a better place for this thread let me know.
     
    Last edited: Dec 1, 2017
    Farmer.J likes this.
  2.  
    Farmer.J

    Farmer.J Well-Known Member

    Does it make the buds smoke harsh if used at the end of flowering?
     
  3.  
    ruwtz

    ruwtz Well-Known Member

    Add K-sil first then pH down to fix res before adding anything else or you will hit a precip - most likely with phosphorus or calcium.

    Don't bother after the stretch as the plant is mostly done growing stems and this is what the silica is best utilized for.

    Cant speak for the brand you've bought but I run it as a dry salt and make my own stock solutions rather than adding directly to the res.
     
  4.  
    HotWaterKarl

    HotWaterKarl Well-Known Member

    From my research it also can increase THC%, makes denser buds (adds weight since it acts like mortar between cells), and thicker stalks as well obviously, but not just thicker stalks? Also I heard it can buffer unwanted or excess metals at the roots, like aluminum, copper, manganese, iron and sodium, as well as preventing too much P uptake which can help with nutrient deficiencies. I am basing the feed schedule from Advanced Nutrients Rhino Skin which says to stop at week 6., it is the same stuff as what I have just a lot more watered down... but I take it from your response, you don't use it past week 2-3 in flowering. That is interesting too, have you ever tried using it until you leech?

    With my de-ionized RO water my PH comes out now below 5. So I am thinking I will no longer have to use PH up anymore with the Silica, which is fine by me as I never liked using it, I always thought it was precipitating nutes out of solution anyways. So I may not have to PH down before adding nutes, adding nutes will PH down it anyways?

    @Farmer.J - I have heard it can if used right up until the end. But I have also heard that there is no noticeable difference in the smoke or burn when used properly, so I guess I won't truly know until I try it.
     
    Last edited: Dec 1, 2017
    Farmer.J likes this.
  5.  
    ruwtz

    ruwtz Well-Known Member

    Interesting stuff! Go for it and let us know if you see these claims for real!

    IMO, there's better gains for bud quality from the extra K than the silica... most people underrate K for heavy feeders in bloom.

    I use to around week 4. Its a little more expensive on the lb and that paired with the fuss of fixing pH is the only reason I cut it back really. No harm no foul going all the way AFAIK.

    Definitely good as pH up, in fact many of the bottles of pH up are just k-sil.

    And no, you definitely have to pH down when adding adequate quantities. I add 100-150ppm and pH can easily hit pH9... adding calcium nitrate to this is a precip disaster 100%. Many salts will acidify but not by 3 whole points.
     
    HotWaterKarl likes this.
  6.  
    HotWaterKarl

    HotWaterKarl Well-Known Member

    What is your input water PH before adding the Silica? Mine is probably around 4.5 and 0 PPM. That's the only reason I wonder if I will need to PH down it, but thanks a million for the heads up. I'd say if the Silica brings it up to around ~7PH I probably don't need to PH down, the nutes will do that for me? I'll just have to try it and find out what it comes out to before nutes I guess... Cheers!
     
  7.  
    HotWaterKarl

    HotWaterKarl Well-Known Member

    Never mind I tried it and it raised my PH from like 4.5-8.3.. So what do I PH down it to considering that the nutes will drop it further still? 6.5-7?
     
  8.  
    Jypsy Dog

    Jypsy Dog Well-Known Member

  9.  
    ruwtz

    ruwtz Well-Known Member

    Yeah, 6.5 is pretty good (i'm in coco though). IME the rest of nutes only bump it down by a few .1's but i'd rather not dip under my target of 5.8pH then have to bring back up. If I hit 5.8-6.1 I don't fuss.

    If you got brains it won't take long to figure out the exact amount of pH down to add every single time for reliably identical results.

    AFAIK pH is not cumulative as you were thinking, ie. starting pH of 4.5 is less prone to reaching 8 or 9 with the addition of k-sil than, say, starting with pH6.. Whatever your starting pH and regardless of how much k-sil you add it won't go beyond 9ish. Its not a strong base!

    FYI for my stock solution I add something like 150g to a quart, then use at 4ml/gal in the res. Even the stock isn't beyond pH9 (don't quote me on those amounts, ask if you're interested).

    Stocks are the way to go if using dry salts: no issues with solubility, clumping, precips etc, and always there ready to go with zero calculating to reach accurate ppm's.
     
    HotWaterKarl likes this.
  10.  
    HotWaterKarl

    HotWaterKarl Well-Known Member

    Dudes, this is really weird. I have my DI 0 PPM water which I added the PS to. Now when I measure with my Blue Lab pen the PH says 6.0 but the drops (I always cross check with drops) says the PH is around 8. I just calibrated the pen with the same results. EC is 0.1 after adding the PS. Why the difference between the pen and the drops, a full 2.0 points???? Bizarre, but I trust the drops more than the pen. Sometimes the blue labs have trouble when the water is pure, but you would think adding the PS would help add a bit of EC and make it ok to measure with...getting the PH correct here before adding nutes is going to be a bit of a shitshow.
     
  11.  
    Carolina Dream'n

    Carolina Dream'n Well-Known Member

    Potassium silicate isn't meant to be used as PH up. You can not add it to low PH water nor water with nutrients already in it.

    Show me one company that has a bottle labeled as PH up and the guaranteed analysis saying potassium silicate.
     
  12.  
    HotWaterKarl

    HotWaterKarl Well-Known Member

    So you are saying you can't add it to low PH water, well my DI water comes out at 0 PPM and PH of like 4.5 So am I supposed to add PH up before adding the PS? I wish nutrient makers would add a bit of info on the bottle.
     
  13.  
    xtsho

    xtsho Well-Known Member

    You adjust the PH after adding everything else.
     
    Farmer.J likes this.
  14.  
    Carolina Dream'n

    Carolina Dream'n Well-Known Member

    Different with 0 ppm water. Shouldn't be an issue if added first.
     
    HotWaterKarl likes this.
  15.  
    HotWaterKarl

    HotWaterKarl Well-Known Member

    That's what you normally do yep...with potassium silicate you add it first then PH down to 6.5 then add your nutes and PH adjust, it would seem.
     
  16.  
    xtsho

    xtsho Well-Known Member

    You are correct. I just read this:

    "Important note:
    CAUTION: Using High amounts of Agsil 16H Potassium Silicate Soluble Silica Powder will cause pH to rise severally.


    Some fertilizers CANNOT handle this high pH and will fall out or become useless!!! To avoid this from happening add Agsil 16h Powder Potassium silicate 1st to your reservoir and then pH adjust down with our Phosphoric Acid until a more desirable pH level is reached like 6.0pH.

    Now add your fertilizers or plant foods like you normally would, and adjust pH one more time prior to feeding your plants."


    http://www.mbferts.com/Agsil-16H-Potassium-Silicate-Soluble-Silica-Powder-545.htm
     
  17.  
    ruwtz

    ruwtz Well-Known Member

    Like I said... :roll:
     
  18.  
    HotWaterKarl

    HotWaterKarl Well-Known Member

    http://www.rollitup.org/t/the-benefits-of-potassium-silicate.355548/
     

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