CAN PUMICE LEECH ALUMINUM

GARRIGA

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Randy,

Knowing Pumice is aluminum silicate yet marketed as being inert than is there documented proof of it leeching aluminum or other elements? I've attached a screen shot I found on it's properties where it is listed as inert except with Calcium Hydroxide yet can't find how exactly does Calcium Hydroxide affects Pumice. Been running it in my test tank since September 2021 and will be sending out an ICP in a couple of weeks and have used Kalk briefly (few days) but even if the results come back lacking excess aluminum there's now a concern I perhaps should stop using it. Have other options but do appreciate that it's the lightest of the options and available at low cost and various sizes.

The item I've been using is sold for orchids. Assumed it would be of a cleaner quality as far as perhaps not having other impurities yet wasn't concerned with the actual material itself since it is marketed as being inert.

PUMICE PROPERTIES.JPG
 
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Randy Holmes-Farley

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Randy,

Knowing Pumice is aluminum silicate yet marketed as being inert than is there documented proof of it leeching aluminum or other elements? I've attached a screen shot I found on it's properties where it is listed as inert except with Calcium Hydroxide yet can't find how exactly does Calcium Hydroxide affects Pumice. Been running it in my test tank since September 2021 and will be sending out an ICP in a couple of weeks and have used Kalk briefly (few days) but even if the results come back lacking excess aluminum there's now a concern I perhaps should stop using it. Have other options but do appreciate that it's the lightest of the options and available at low cost and various sizes.

The item I've been using is sold for orchids. Assumed it would be of a cleaner quality as far as perhaps not having other impurities yet wasn't concerned with the actual material itself since it is marketed as being inert.

View attachment 3127611

It may release some. Ignore the reactivity comment claiming it is inert. That is likely not based on any real evidence (aside from it looking like it didn't dissolve), and the election of calcium hydroxide as special (over other, much stronger hydroxides)l is, IMO, evidence of lack of rigour.
 
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GARRIGA

GARRIGA

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GARRIGA,


How much pumice did you add to your system?



I was considering to try it here but I got a little concerned about aluminum leaching.


Can you please share your ICP?


Cheers.
Added 4g to a 20g tank. Haven’t sent ICP out yet. Curious myself to know and will post up the results
 

Carlos Oliveira

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Added 4g to a 20g tank. Haven’t sent ICP out yet. Curious myself to know and will post up the results

Can you also show some pictures of the pumice you used? Because there is a lot of colors and shapes out there...

For example there is some beauty products listed as pumice, but I'm not really sure what are they...

This one is for beauty purposes and costs only 1 buck:

1684881780496.png
 
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GARRIGA

GARRIGA

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Can you also show some pictures of the pumice you used? Because there is a lot of colors and shapes out there...

For example there is some beauty products listed as pumice, but I'm not really sure what are they...

This one is for beauty purposes and costs only 1 buck:

View attachment 3166409
Pumice I purchased marketed for orchids from Home Depot. Same size and texture as Denitrate from Seachem. Not sure how pumice stone for back scrubs would work. Wanted something inert. Guessing anything for orchid should be safe.
 

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