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 Post subject: Quinny's iAVs test
PostPosted: Apr 19th, '22, 22:51 
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For a while I have been wondering what use is this sand we have all over the place in Perth.
It's water resistant and difficult to grow what you want without constantly adding supplements like clay, soil wetter, fertilizer, worm juice, compost, food scraps, manure, etc...

I have been reading up on iAVs or sandponics recently. I wondered, can this sand we have everywhere be used in an iAV system?

Here is my attempt to see if this works.

Here is a typical pile of dirt.
Attachment:
1_dirt.jpg
1_dirt.jpg [ 145.97 KiB | Viewed 1508 times ]


I have two filters set up. One is an old colander to filter out the large objects.
The second is a stretched stocking which filters out the small debris.

Attachment:
2_filter.jpg
2_filter.jpg [ 126.75 KiB | Viewed 1508 times ]


Looking down into the large filter.

Attachment:
3_filter.jpg
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This is the sand left after the large objects have been filtered out.
Attachment:
4_filtered_sand.jpg
4_filtered_sand.jpg [ 111.85 KiB | Viewed 1508 times ]


As you can see here, even though the bucket has been flooded, the sand underneath is still dry.
Attachment:
5_show_dry_sand.jpg
5_show_dry_sand.jpg [ 120.75 KiB | Viewed 1508 times ]


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 Post subject: Re: Quinny's iAVs test
PostPosted: Apr 19th, '22, 22:56 
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Here is some more of my sand cleaning pics.

This is the stocking filter to remove the small debris from the sand.
Attachment:
6_nylon_filter.jpg
6_nylon_filter.jpg [ 59.68 KiB | Viewed 1507 times ]

Attachment:
7_nylon_filter.jpg
7_nylon_filter.jpg [ 99.1 KiB | Viewed 1507 times ]


These are the very small particles removed from the sand.
Attachment:
8_filtered_out_sand.jpg
8_filtered_out_sand.jpg [ 77.81 KiB | Viewed 1507 times ]


This is the now filtered sand, after having removed the large objects and the small debris.
Attachment:
9_filtered_sand.jpg
9_filtered_sand.jpg [ 58.52 KiB | Viewed 1507 times ]


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 Post subject: Re: Quinny's iAVs test
PostPosted: Apr 19th, '22, 22:59 
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Here is a sample of sand I cleaned earlier.
Attachment:
10_prepared_earlier.jpg
10_prepared_earlier.jpg [ 67.23 KiB | Viewed 1491 times ]


Here is a close up of the sand. You can see how varied it is.
Attachment:
11_closeup_sand.jpg
11_closeup_sand.jpg [ 83.74 KiB | Viewed 1491 times ]


Here is the TDS reading for water from the garden hose.
Attachment:
12_tds_water.jpg
12_tds_water.jpg [ 115.62 KiB | Viewed 1491 times ]


Here is the TDS reading after the water was added to the sand. Even though the water is cloudy it still didn't show a large increase.
Attachment:
13_tds_sand.jpg
13_tds_sand.jpg [ 53.45 KiB | Viewed 1491 times ]


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 Post subject: Re: Quinny's iAVs test
PostPosted: Apr 20th, '22, 03:46 
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I think if I were to diy my sand, I'd use a large piece of window screen. More than likely loose the sand on the smaller end of the prescribed size range, but the silt should be gone.


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 Post subject: Re: Quinny's iAVs test
PostPosted: Apr 21st, '22, 02:12 
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That is good looking sand in my opinion. I suggest doing the sand tests for iavs to verify. But what a lot of work to get the clean sand. That would be a big operation to get useable amounts. I have over 3000l of media in my system, there is no way I would want to mine it myself. I am hopeful I never need to clean it.

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 Post subject: Re: Quinny's iAVs test
PostPosted: Apr 21st, '22, 10:38 
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Thank you for the thoughts.

At the moment I am waiting for the sand to dry out to see if it will still be water resistant.

Cleaning the sand is a slow process but I am only going to do a small test and if it works I will think of an easier and faster way to clean it.

I am using an old laundry sink (stainless steel) and only part way filling it. I covered the drain with some fly screen and the sand is staying in the sink.

At least I know all the water drains out.

I can get Gin Gin Sands (silica) here and it costs about $80/trailer I think. That will be option 2.


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 Post subject: Re: Quinny's iAVs test
PostPosted: Apr 23rd, '22, 23:50 
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I have tested the washed sand and it is still water repellent.

Looks like I am going to start option 2.


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 Post subject: Re: Quinny's iAVs test
PostPosted: Apr 25th, '22, 09:12 
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What is "water repellant" sand? Is it coated/contaminated with something?


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 Post subject: Re: Quinny's iAVs test
PostPosted: Apr 25th, '22, 17:55 
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It is hydrophobic sand. I tried to find a video of it but couldn't find one.

I will take a video as it's much easier to see what I mean than to describe it.

Here's a quote about Perth sand from a Perth gardening website:
"Sandy soil like we have in Perth, is often water repellent or non-wetting. In fact, Perth has some of the most hydrophobic soils in the world."


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