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#### Mmiller2001

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If I mineralize my RO with Potassium Carbonate to 1.5dKH (20ppm K). How much ppm of K would be dosed into my 40 gallon tank after a 50% water change? 10ppm roughly?

Thank you.

#### Savetheplants

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20 gallons x 3.785 liters x 26.85 mg/l KHCO3 in 1.5 dKH x 39.053% K in KHCO3 ÷ 151.4 liters in the tank = 5.24 mg/l K dosed into the tank after your water change.

EDIT: No wait a minute. Something is wrong with that. Sorry.

20 gallons x 3.785 liters x 44.05 mg/l KHCO3 in 1.5 dKH x 39.053% K in KHCO3 ÷ 151.4 liters in the tank = 8.60 mg/l K dosed into the tank after your water change.

That's my final answer. It could still be wrong though.

Bump that down to 8.60 mg/l K x 0.85 for displacement in the tank = 7.31 mg/l K

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20 gallons x 3.785 liters x 26.85 mg/l KHCO3 in 1.5 dKH x 39.053% K in KHCO3 ÷ 151.4 liters in the tank = 5.24 mg/l K dosed into the tank after your water change.

EDIT: No wait a minute. Something is wrong with that. Sorry.

20 gallons x 3.785 liters x 44.05 mg/l KHCO3 in 1.5 dKH x 39.053% K in KHCO3 ÷ 151.4 liters in the tank = 8.60 mg/l K dosed into the tank after your water change.

That's my final answer. It could still be wrong though.
Bump that down to 8.60 mg/l K x 0.85 for displacement in the tank = 7.31 mg/l K

Lol in my own mind I saw your brow furrowing and the gears grinding 😆 I'm sorry, it just amused me. I love the detailed equations on this site, thanks so much for these!!

#### Mmiller2001

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##### Registered
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137 Posts
Discussion Starter · ·
20 gallons x 3.785 liters x 26.85 mg/l KHCO3 in 1.5 dKH x 39.053% K in KHCO3 ÷ 151.4 liters in the tank = 5.24 mg/l K dosed into the tank after your water change.

EDIT: No wait a minute. Something is wrong with that. Sorry.

20 gallons x 3.785 liters x 44.05 mg/l KHCO3 in 1.5 dKH x 39.053% K in KHCO3 ÷ 151.4 liters in the tank = 8.60 mg/l K dosed into the tank after your water change.

That's my final answer. It could still be wrong though.
Thank you!

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