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Old 01/17/2020, 12:31 AM   #26
bertoni
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The filter might not be removing the precipitate, but that won't affect the phosphate reduction over the short term. It'd take a low pH event to free the phosphate in the precipitate, if my memory is correct.


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Old 01/17/2020, 08:50 AM   #27
Dimorb
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Quote:
Originally Posted by bertoni View Post
The filter might not be removing the precipitate, but that won't affect the phosphate reduction over the short term. It'd take a low pH event to free the phosphate in the precipitate, if my memory is correct.
Thank you for your responce. I'm concerned since the ICP shows "free" lanthanum chloride.

Shouldnt it be impossible to have free lanthanum when I also have phospates and high carbonates.. it should react shouldn't it?

Lanthanum that reacted with phospates and/or carbonates get stuck in the fleece so the free lanthanum must be going through the filter without reacting with neither phosphate or carbonate. Does that mean I need to increase or decrease the flow when dosing? Should I increase och dilute the solution?

Do you have any other advice except waiting for ICP to see if the lanthanum is contaminated?

Is there something that can be done to trap lanthanum that is "free" in the water?


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Old 01/17/2020, 11:15 PM   #28
bertoni
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Lanthanum phosphate will dissolve to a small degree in saltwater, so the presence of small amounts of lanthanum in solution is to be expected.

If the lanthanum passes through the fleece, it'll react later up to the solubility limits. If your tank isn't getting any precipitate, the flow rate likely is fine as is.


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