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alk residue blocking Doser hose tip

Discussion in 'Chemistry' started by jas, Apr 11, 2015.

  1. jas

    jas Registered

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    Hi fellas, this is a new one for me, I've had to change alk brands twice recently and every 2-3 days there is enough buildup of chalky alk residue on my Doser tube tip, it is blocked. I can't figure if its too highly concentrated or if the salt spray from my sump is causing this. Any ideas on how to not have this issue?
     
  2. Eyore

    Eyore Guest

    What concentration are you mixing it?

    Try halfing it
     
  3. jas

    jas Registered

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    Yes Nigel, that was my only possible thought as well. I'm not sure of the concentration since it arrives in a bag with a recipe tagged to it....no details.
    Others have said to submerge the hose ends into the sump. Couldn't that cause seawater to travel into the Doser lines ?
     
  4. Eyore

    Eyore Guest

    I mean concentration you mix at? 50g/l 100g/l etc

    Obviously impurity such as calcium or magnesium has to precipitate out to a degree as calcium and magnesium carbonate is minimally soluable

    Temperature of tube (cold room) will lead to precipitation to

    And then it will always precipitate at the end of the tube, though i never blocked a tube with this, every few months i just pull it off. There is imo no need to dose underwater, in fact i think it will be probematic for 2 reasons- (a) it will reduce the dispersion of bicarb, posdibly localised precipitation under water (b) any potential of ecen a slight back syphon will be really probematic, as seawater of 35ppt containing nearly 1.8% of calcium and magnesium mixed into bicarb should produce calcium and magnesium carbonate imo, not that i know from experience or teaching to be clear

    Some put atu over their bicarb hose (not a bad idea imo) though i do not
     
  5. jas

    jas Registered

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    The recipe calls for 500g soda ash/1 gallon of to water.
     
  6. jas

    jas Registered

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    My new brand asks for 430g/gallon. And this morning my tube tips are clean :).....of course my Alk might be dropping ng too :/
     
  7. Eyore

    Eyore Guest

    Carbonate should easily saturate at those amounts
     
  8. jas

    jas Registered

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    Maybe impurities? Either way, my new mix is dosing cleanly.
     
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