Another twist due to the low temps

Discussion in 'General Discussions and Advice' started by gaboon, 17 Jun 2010.

  1. gaboon

    gaboon

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    Got a skrik just now, tanks ph has dropped to 7.8! Quickly realised it's because of the fan not running over the waters surface and therefore minimal evaporation to kick in the kalkstirrer

    I'm a little confused as most don't use fans for cooling so how do you keep ph stable? Normally in summer my tanks ph is 8.1 - 8.4, with heavy evaporation and topping up through the kalkstirrer. My calcium demands are pretty high.

    Any ideas?
     
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  3. scubaninja

    scubaninja

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    yes, dose your kalk via a timer, i dose about 10 minutes worth of kalk throughout the day. found that time through lots of trials and testing. the auto top up then deals the balance of the RO necessary. This way my dosing is not dependant on top ups. Much more stable this way ;)
     
  4. Alan

    Alan Admin MASA Contributor

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    I add kalk using the slurry method and keep the PH up at about 8.5 - 8.6.
     
  5. jacquesb

    jacquesb Retired Moderator

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    Alan - for the sake of our newer members (and newbies) - could you perhaps re-iterate what this "slurry method" entails? Or perhaps supply a URL where this is explained that you find useful?
     
  6. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Howzit Gaboon? Another reason why most guys will find their ph dropping is, because in winter, we tend to close our windows and doors due to the cold, therefore increasing the Co2 level inside our houses, thus causing the tanks Ph to drop.
     
  7. RiaanP

    RiaanP Moderator

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    And gas heaters, they must push the CO2 levels in the house up as well?

    Should water evaporation not be more with colder air around the tank?
     
  8. Mekaeel

    Mekaeel Moderator MASA Contributor

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    100% Riaan. Evaporation really increases. I noticed my tank taking an extra +-2 liters a day recently
     
  9. jacquesb

    jacquesb Retired Moderator

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    Jip - same thing here. My water evaporation is also up. Not sure if it due to the cold, or dryness in the air.....

    BUT, my pH is stable. It must be because my wife opens up the windows in the daytime when we are not there.... I have 4 x 300 watt heaters in my "system" (one in the DT, and 3 in my sump tanks).... This could also be due to the fact that I have +-1500 liters of water....
     
  10. RiaanP

    RiaanP Moderator

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    Yes and my RO drum was almost empty yesterday afternoon, where it normally last at least until Saturday morning. It is a 90L drum. So what I found is that my Kalkstirrer is also empty, where it also should last until Saturday. Because the RO-topup goes via kalkstirrer. So I'm using MORE kalk than before. So that is totally the other way around for me
     
  11. gaboon

    gaboon Thread Starter

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    Ahhh, its all making sense now:), started the gas heater on Sunday and all windows closed. When the fans were going in summer I was going through about ±35L RO in a week, it has dropped quite a bit now with them off. Should I be trying to add O2 to the tank?

    The ph in the latest TOTM on reefcentral is kept at 7.7 - 8.1, would it be safe to let my ph drop to this naturally over the winter period? I'll obviously make sure the other params are stable.
     
  12. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Gaboon, there is nothing wrong with a low Ph, however, I wouldnt let it drop below 7.7.
     
  13. RiaanP

    RiaanP Moderator

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    Or else, tonight switch off the gas heater and throw open the windows...
     
  14. Garethmur

    Garethmur

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    am i correct in saying that slaked lime is the stuff to raise the PH? i saw last night that my PH is also low... on a 350L tank how much would one "Dose" to raise the Ph about .5 ?
     
  15. jacquesb

    jacquesb Retired Moderator

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    Jip Gareth - Slaked Lime (Calcium Hydroxide) as well as Sodium Bicarbonate can be used to raise the pH..
     
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