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  1. Sacha

    pH pens and low KH

    Been having a few issues trying to get an accurate pH profile so I'll try and make this as clear as possible... I have a cheap pH pen from eBay. From what I can tell, it works extremely well. My reason for saying this is that, even after 3 months of sitting unused and dry, it still gets the pH...
  2. Sacha

    Advice please- KH/ GH/ TDS

    This is linked to a question I asked earlier in a different thread. I use RO water in my tank, and I currently remineralise using JBL Aquadur. I have done tests, and found that adding enough Aquadur to raise the TDS to 100, brings the KH up to 0.75. Based on this, if I want a KH of 3.75...
  3. Sacha

    What TDS should I aim for?

    I use RO water, and I remineralise using JBL Aquadur. I typically remineralise to a KH of 4. After dosing with EI, TDS ends up in the 300s. Should my TDS be lower? If so, that would mean using less Aquadur, which has two drawbacks. Lower KH means pH swings are more likely, and more acidic...
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