Trisodium Phosphate dosing math
- Thread starter Chris Villalobos
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Yes, or you could use the math I already posted.
1. add 1.88g of the Trisodium Phosphate to 1 liter of water,
2. Adding 1 mL per 100 L of tank water will boost phosphate by 0.01 ppm (so add 1.52 mL).
Trisodium phosphate is 58% phosphate by weight.
Adding 0.1 gram to 100 liters of tank water will boost phosphate by 0.6 ppm.—————————————————Just to clarify, that stock solution is 1090 ppm phosphate (1.88 x 0.58 g/L or 1.09 g/L or 1,090 mg/L).
Adding 1 ml per liter of tank water will boost phosphate by 1 mg/L.
Adding 1 mL per 100 L of tank water will boost phosphate by 0.01 ppm.
Does anyone know how to calculate how many gallons of liquid are needed to raise the phosphate level 1 ppb in 10,000 gallons of water assuming the liquid that you're adding contains a mixture of 50 pounds of sodium tripolyphosphate in 275 gallons of water?
Barks
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Hi randy,Yes, or you could use the math I already posted.
1. add 1.88g of the Trisodium Phosphate to 1 liter of water,
2. Adding 1 mL per 100 L of tank water will boost phosphate by 0.01 ppm (so add 1.52 mL).
lim just about to raise my phosphate from zero, can I go straight to 0.05 or should it be done gradually?
many thanks
Randy Holmes-Farley
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It won’t go up as fast as you add it. Much will bind to rock and sand. 0.05 ppm seems fine to add and see what happens.
Randy Holmes-Farley
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As an approximation, 1 mL bulk powder weighs about 1 g. That's close enough for our purposes here.
As an approximation, 1 mL bulk powder weighs about 1 g. That's close enough for our purposes here.
Thanks that appears to be close enough. I used a bulk density of 950 kg/cubic meter and a weight of 1.88 grams. Did some conversations and used the formula p=m/v, and ended up with a value of 0.40 tsp. Using the approximation I calculated 0.38 tsp. So, like you said, for our purposes, the approximation is close enough and conservative.
As an approximation, 1 mL bulk powder weighs about 1 g. That's close enough for our purposes here.
I have added 0.16 ppm over the course of the week and still read "0" on my Hanna ULR after 3 separate tests 2-12 hours after dosing. Are biological and sorption processes happening that are stripping the phosphates so quickly? I have seen no uptick in algae growth anywhere. besides the little bit of transitional algae I have after treating for Golden algae.
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Yes, that's pretty much expected.
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Thank you for the clarification. I’ll order that one. Will this have the same ratios for dosing as described in previous posts?
Maximitsurugi
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Just to clarify, that stock solution is 1090 ppm phosphate (1.88 x 0.58 g/L or 1.09 g/L or 1,090 mg/L).
Adding 1 ml per liter of tank water will boost phosphate by 1 mg/L.
Adding 1 mL per 100 L of tank water will boost phosphate by 0.01 ppm.
I know the post is old Randy but does trisodium phosphate solution lose potency over time? Or is my hanna having a problem reading it? My reagents are good until 2022.
I mixed some the other day and it seemed to do the trick but after a few months i only ever read 0 on my hanna and when i put a little in the vial directly it doesnt turn bkue like it used to. This led me to sprinkle a tiny bit of TSP crystal itslef into the vial and BOOM blue.
Has my mixture expired? Lol
Randy Holmes-Farley
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If it is the only thing in the solution, it won't go bad.
Perhaps demand in the tank has risen.
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Maximitsurugi
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If it is the only think in the solution, it won't go bad.
Perhaps demand in the tank has risen.
Its actually the solution tyat seemed to getvweaker but i just tossed ot out and mixed some up fresh. Lol
Will any tsp work or....? I have a box of this as it was handy to buy but when I mix up a solution of it and add lots to a test bucket of water my phosphate reading is still zero. I test my tap water and it reads at 0.03. Is this normal or should I toss this tsp and search for another?
