Is rotala butterfly calculator off? - The Planted Tank Forum
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post #1 of 3 (permalink) Old 03-29-2019, 08:35 PM Thread Starter
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Is rotala butterfly calculator off?

When I punch in the numbers for K2So4 the number is near double as compared to the pps pro page. Why is this or who's right? For a 500ml solution at 1ml/10gallons pps says it's 29.3g And rotala says it's 56.1g. Both claim to achieve 1.33ppm of K.

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post #2 of 3 (permalink) Old 03-30-2019, 09:08 AM
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Because I believe @Edward factored in K from KNO3 and KH2PO4 into the K ppm. Basically, you are comparing all K sourced from K2SO4 on Rotala against K sourced from all three salts on the PPS site.
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post #3 of 3 (permalink) Old 03-30-2019, 06:53 PM Thread Starter
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Yes that makes sense. I didn't consider that. Thanks!
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