DIY PH Down from Sulfuric Acid. (Battery Acid)

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Brunob

New Member
When it comes to using phosphoric acid and sulphuric acid to lower pH, is one better than the other?
I can get 5L of 76% sulphuric acid for $55 and 5L of 85% phosphoric acid for $28. Which on is better value? Will I need to use less of the sulphuric acid compared to the phosphoric acid to achieve the same desired outcome when lowering pH?
 
Budzbuddha

Budzbuddha

Well-Known Member
Brunob said:
When it comes to using phosphoric acid and sulphuric acid to lower pH, is one better than the other?
I can get 5L of 76% sulphuric acid for $55 and 5L of 85% phosphoric acid for $28. Which on is better value? Will I need to use less of the sulphuric acid compared to the phosphoric acid to achieve the same desired outcome when lowering pH?
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Why complicate things ? …. You literally can get a gallon of GH PH down for $20 bucks or so.

IMG_5424.jpeg
 
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nxsov180db

Well-Known Member
Brunob said:
When it comes to using phosphoric acid and sulphuric acid to lower pH, is one better than the other?
I can get 5L of 76% sulphuric acid for $55 and 5L of 85% phosphoric acid for $28. Which on is better value? Will I need to use less of the sulphuric acid compared to the phosphoric acid to achieve the same desired outcome when lowering pH?
Click to expand...
Not sure which one is a better value or but Sulphuric is a stronger acid, I use sulphuric because its cheap locally.
 
ttystikk

ttystikk

Well-Known Member
Brunob said:
When it comes to using phosphoric acid and sulphuric acid to lower pH, is one better than the other?
I can get 5L of 76% sulphuric acid for $55 and 5L of 85% phosphoric acid for $28. Which on is better value? Will I need to use less of the sulphuric acid compared to the phosphoric acid to achieve the same desired outcome when lowering pH?
Click to expand...
Phosphoric acid brings a more desirable nutrient and sulfuric acid in battery acid may not be food grade.

Where are you getting phosphoric acid so cheap?
 
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Brunob

New Member
ttystikk said:
That's more what I was thinking. My concern about battery acid is whether it's food grade.
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I'm only growing tropical indoor plants so doesn't matter about food grade, but it's pure sulphuric acid with no impurities so I'm sure it would be
 
ttystikk

ttystikk

Well-Known Member
Brunob said:
I'm only growing tropical indoor plants so doesn't matter about food grade, but it's pure sulphuric acid with no impurities so I'm sure it would be
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Food grade is a big can of worms that you don't need to address if you're just growing decorative varieties.
 
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