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By optique
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Posts:  1035
Joined:  Fri May 24, 2019 11:15 pm
#385291
So i have been playing around with floating plants this summer I have 80g tub just for them that i dose fertilizer. i have dropped hand fulls of water spangles(small floating fern) in my large treys of CP's. They grow smaller and decline in health but they really reduce the TDS.

My tap water is 24 TDS so when i add water i over fill to counter build up of solids over time, still my tubs can hang around 50 or so. After adding water spangles the TDS is much lower. Yesterday it was 15 and i have not been overflowing the water in the past few fill ups.

I picked water spangles(Salvinia minima) for the test because they have shorter roots and double there population daily when i use ferts in my water plant tub.

I don't have the means to test what the plants are removing and what they are not removing but the TDS is really dropping
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By elaineo
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Joined:  Tue Jul 24, 2012 4:07 am
#387139
@optique, How is your floating plant project coming along? I am having trouble keeping my water spangles alive. I have them in small bowls with different types of water, distilled and tap, with small amounts of maxsea.
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By optique
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Joined:  Fri May 24, 2019 11:15 pm
#387142
they seem to be doing great, they are taking over my CP and rain water collection tubs. I was thinking about trying azolla next year because its symbiotic bacteria can make use of atmospheric nitrogen, i think that would be a big advantage growing in such low TDS water.
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By elaineo
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Joined:  Tue Jul 24, 2012 4:07 am
#387151
optique wrote:they seem to be doing great, they are taking over my CP and rain water collection tubs. I was thinking about trying azolla next year because its symbiotic bacteria can make use of atmospheric nitrogen, i think that would be a big advantage growing in such low TDS water.
Oh, so spangles prefer low TDS water too? I must have overdone it with the maxsea. Will try again :)
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By optique
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Posts:  1035
Joined:  Fri May 24, 2019 11:15 pm
#387166
I think spangles prefer nutrient rich water. what i was trying to say is azolla has a symbiotic bacteria that feeds on nitrogen gas in the air breaking it down into a form the azolla its self can use, kind of like coral in the ocean that have symbiotic algae. I think that would help it grow in low TDS water.

ImageImage
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By elaineo
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Joined:  Tue Jul 24, 2012 4:07 am
#387170
optique wrote:I think spangles prefer nutrient rich water. what i was trying to say is azolla has a symbiotic bacteria that feeds on nitrogen gas in the air breaking it down into a form the azolla its self can use, kind of like coral in the ocean that have symbiotic algae. I think that would help it grow in low TDS water.

ImageImage
Wow, your spangles look great! I assume that is low TDS water, since your CPs are in it?
Supercazzola liked this

plz and ty

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