Alk question

Discussion in 'Reef Chemistry by Randy Holmes-Farley' started by cwb_reeftank, Feb 13, 2017.

  1. cwb_reeftank

    cwb_reeftank Well-Known Member

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    I try to keep my tanks alk between 7-9 but when I use my red sea salt(not the pro) it brings my alk back up to 11. I was wondering if I had a bad batch of salt or something else.
     

  2. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Expert Contributor Article Contributor

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    How much water are you changing at once?
     
  3. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Expert Contributor Article Contributor

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  4. cwb_reeftank

    cwb_reeftank Well-Known Member

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    im doing 10-15 gallons a week in a 55 gallon tank and yes that one
     
  5. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Expert Contributor Article Contributor

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    It shouldn't be raising the alk. Maybe there is testing error, a batch with super high alk, serious settling in the bucket if you only used part of it, or testing error. I can't tell which, but making some more salt water and testing it for alk is a good start on figuring it out.
     
  6. cwb_reeftank

    cwb_reeftank Well-Known Member

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    That's what I thought but wasn't sure I'll try to mix up my salt tonight than make some new water and test it than add it and test that. Oh I also test with a hanna checker
     
  7. redfishbluefish

    redfishbluefish Stay Positive, Stay Productive R2R Supporter R2R Excellence Award Reef Squad Build Thread Contributor NJRC Member Article Contributor

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    One additional thought......how are you measuring salinity. If it's a swing-arm hydrometer, they are known to be inaccurate. That is, if you're unknowingly making a higher concentration of salt, it would also drive up alkalinity. Just a thought.
     
  8. cwb_reeftank

    cwb_reeftank Well-Known Member

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    I use a refractometer to check my salinity and I keep it as close to 1.025 as I can
     
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