Silicate???

Kershaw

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ok so with silicate based sand, what causes it to release silicate into the water. Is it caused by low or high ph or is it another chemical that releases it. Since the other sand buffers the ph by the ph dropping it breaks down the sand raising ph. So I am just wondering what causes the silicate to be released. Thanks.
 
HERE's a Randy article that talks about silica.....about half way through he specifically talks about silica sands.
 
I used "randy holmes farley silica sand". I find that for aquarium chemistry stuff, just prepending "randy holmes farley" to the simple search term works very, very well.
 
Did it answer your question?

IMO, the fastest release of silicate from new sand, especially sand that is not natural beach sand, is the dissolution of silicate minerals that are exposed at the particle surfaces, as opposed to the slower dissolution of silica itself.

Here's a graph of silica solubility in fresh water as a function of pH:

https://www.lubrizol.com/Dispersant...pers/Solutions-Chemistry-Impact-on-Silica.pdf

silica solubility vs pH.jpg
 
Yes it did. I am using beach sand from a beach ca. It is mix of quarts and garnet. The garnet. Randomly I will have small algae out brakes on my sand and glass. And when po4 and no3 are checked it is extremely low or undetectable. So I will run gfo and it goes away. It appears as nothing changes that causes the bloom so I was just wondering how much silicate is actually in my tank.
 
Yes it did. I am using beach sand from a beach ca. It is mix of quarts and garnet. The garnet. Randomly I will have small algae out brakes on my sand and glass. And when po4 and no3 are checked it is extremely low or undetectable. So I will run gfo and it goes away. It appears as nothing changes that causes the bloom so I was just wondering how much silicate is actually in my tank.

FWIW, diatoms need silicate and are golden brown, but they also need a source of N and P, just like green algae. :)
 
Randy as we have been talking about sand rinses in other threads I had posed the idea that during production, shipping, grain grinding etc the wet pack bagged sands present with a super mega high surface area silt factor (flocculants often included in the bag to remedy) that should be pre rinsed out instead of sinked. literally removed, leaving only heavier sand grains...not floc'd to the bottom.

considering your mention of surface area and dissolution I kept thinking the powder vs the grain sure sounds more presentable silicate to the system, and early invaders who feast on that. Blast rinsing 100% of the dusty silt out of my tank always seemed to factor with zero diatom stages. My theory was that since 99% of reef tank builders feel that rinsing live sand will destroy its bac complement we universally start out tanks with a high fraction of silt and the tank invaders that often show up could have been lessened by starting differently, whats your take on Si being more readily available to the system by not pre-rinsing?
 
Randy as we have been talking about sand rinses in other threads I had posed the idea that during production, shipping, grain grinding etc the wet pack bagged sands present with a super mega high surface area silt factor (flocculants often included in the bag to remedy) that should be pre rinsed out instead of sinked. literally removed, leaving only heavier sand grains...not floc'd to the bottom.

considering your mention of surface area and dissolution I kept thinking the powder vs the grain sure sounds more presentable silicate to the system, and early invaders who feast on that. Blast rinsing 100% of the dusty silt out of my tank always seemed to factor with zero diatom stages. My theory was that since 99% of reef tank builders feel that rinsing live sand will destroy its bac complement we universally start out tanks with a high fraction of silt and the tank invaders that often show up could have been lessened by starting differently, whats your take on Si being more readily available to the system by not pre-rinsing?

High surface area may well impact the rate of dissolution.

One prominent reef expert once "proved" that silica sand cannot dissolve because our glass tanks are made of it, and they are not dissolving. One factor he forgot is the very much higher surface area of sand vs flat panes of glass (and the second is that one might hardly notice a tiny bit of dissolution from the glass surface).
 

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