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I am trying to keep my KH stable at 3 or 4dKH. I've heard that it is better to dose the tank's water changes with KHCO3 rather than NaHCO3 since potassium is readily taken in by plants whereas sodium is not. Any KHCO3 branded products that you would recommend to buy online? is ADA Brighty K also a good KH booster? Thanks
 

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I got some from a friend who had bought a large bag intended for agriculture.

I have not looked into the shipping costs of either of these options:

Here is a place that sells it, and most other fertilizers, used in hydropnics, aquaponics, greenhouse production and similar uses. If you need several other fertilizers, a combined package might be cheaper than getting several shipments from different suppliers.
http://www.jrpeters.com/Products/Specialty-Nutrients/Buy-Specialty-Nutrients.html

Here is a source that is cheaper for just the KHCO3. 1lb can last for a long time.
https://nuts.com/cookingbaking/leav...scplp2863580&gclid=COjZp9XkssYCFVFefgodoaUMIw
 
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