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#1
05-30-2009, 11:36 PM
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Yes I am pretty sure that the silica bound up in the crystalline structure of glass and sand is a different animal than the kind in suspension or cement. Here are the results of the silicate tests I took at the time of my aragocrete project:
RO water .25 PPM tap water .5 PPM tank water with aragocrete 2 PPM & above note that 2 PPM is the upper limit of the test, so god knows how much silica was in that water. I didn't test the water after yanking the aragocrete and haven't tested lately but as soon as the cement came out the diatom bloom died off. I will make some more tests soon and see for sure what was going on. I haven't given up on aragocrete yet anyway and think it is good idea. 
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#2
05-30-2009, 11:47 PM
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I made about 100 lbs of rock with cement. I don't have a diatom problem or any other problem. I made my rock in about march last year and I did weekly(ish) water changes in a rubber made bin in my yard. I fired up my tank in sept.
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http://www.photobucket.com/newbuthandy
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#4
05-31-2009, 04:58 AM
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I used portland mixed with different things. Salt, crushed coral, different mixes ect.
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http://www.photobucket.com/newbuthandy
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#5
05-31-2009, 03:15 PM
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I made about 20lbs of agrocrete last June, I made some with interesting shapes, some with pvc tubes through it, and some with pasta shells to create voids. I put the pieces in toilet fresh water tank so that each time the toilet flushed my rock got a water chage. I didn't notice any leaching once put into the tank.
Joe
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210 Gallon slowly gaining population. Foxface, Naso, Coral Beauty, 2 Clowns, 2 Chromis, Orange Anthias, and Striped Goby.
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Hybrid Mode
