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Old 01-05-2019, 01:00 AM #1
bobbyjaxx
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Calcium source for dwc that doesn't have nitrogen

I need boost my Ca without added N. What is a good alternative to calnit???
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Old 01-05-2019, 01:49 AM #2
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Calcium Sulfate dihydrate is water soluble, here is a link to solution grade 22% calcium and 17% sulfur 50lb bag for $11.25 before shipping:

https://customhydronutrients.com/cal...701c63ab96661f
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Old 01-05-2019, 01:59 AM #3
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For calcium, I'm now using CaribSea Aragonite Aquarium Reef Sand I purchased from a pet store.
They use it for saltwater aquariums and I'm not running my aquarium now. So why not use it.
Aragonite is the most soluble form of calcium carbonate. It doesn't have nitrogen or phosphorus.

Outdoors, I normally just use less expensive Dolomitic Limestone purchased from a garden center.
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Old 01-05-2019, 02:05 AM #4
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Calcium Sulfate dihydrate is water soluble, here is a link to solution grade 22% calcium and 17% sulfur 50lb bag for $11.25 before shipping:

https://customhydronutrients.com/cal...701c63ab96661f
I think this will end up settling to the bottom, no?
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Old 01-05-2019, 04:34 AM #5
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I need boost my Ca without added N. What is a good alternative to calnit???

Ca EDTA. Be sure to dissolve before adding.
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Old 01-05-2019, 04:35 AM #6
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Oh and ask the guy (Brian) at Custom Hydro because he is an extremely knowledgeable and honest person. I have never known him to give bad advice.
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Old 01-05-2019, 04:51 AM #7
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I think this will end up settling to the bottom, no?
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Pure calcium sulfate dihydrate is indeed fully water soluble
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Yeah, I've tried both adding it to water and top dressing it + watering it in and in both cases it dissolves immediately.
Lot of good info on gypsum and calcium availability in this thread: (much more availability to plant with aminos added, info is in thread)

https://www.icmag.com/ic/showthread.php?t=357679
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Old 01-05-2019, 05:03 AM #8
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Thanks everybody
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Old 01-05-2019, 10:28 AM #9
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Thanks everybody

Oops also Ca Acetate which has high solubility. It's food grade so can be hard to source and a tad pricy.
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Old 01-06-2019, 01:36 AM #10
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Calcium chloride.. But I'm not into chloride.

I have never had an issue with calcium nitrate. I just adjust for it. Straight bloom booster and calcium nitrate is still to low in N
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