Removing Si02 from tap water - The Planted Tank Forum
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post #1 of 4 (permalink) Old 02-08-2019, 09:52 PM Thread Starter
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Removing Si02 from tap water

Hi, does anyone know how to remover silicates SIO2 from my tap water? My readings are off the test kit chart. I currently have Ro holding tank as my set up which removes it. However it’s getting costly heating the water before the water change. Ideally I would like to use hot water from the tap to mix with my Ro to get to temperature. It’s still very high when I have tried this. Just trying to find out a way to remove it so I can use hot water... any help thanks
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post #2 of 4 (permalink) Old 02-08-2019, 10:04 PM
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If you make your water the day before it warm to room temp, you might find you don't even need to warm it more at that point. At the very least, you won't need much from a heater or warm tap water to get to temp.

1 Are you starting with cold RO water?
2 How big's your tank?
3 What's your tank temp?
4 What temp do you keep your house?
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post #3 of 4 (permalink) Old 02-08-2019, 10:29 PM Thread Starter
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Thanks for suggestions. However the holding tank is 120liters the two aquariums I have are 470 litres & the other being 580L the Ro is cold my water is from a spring and is very cold at this time of year as it is. Would much prefer to remove SIO2 from water supply
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post #4 of 4 (permalink) Old 02-09-2019, 12:10 AM
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Are silicates still high after you mix your hot tap water with your cold RO water?

Volume of water is pretty high. I was gonna suggest boiling some of the RO water but I bet you'd need to boil 5+ gal this time of year to get up to temp. Easily done with a turkey fryer or if you happen to be a homebrewer. Otherwise it's just a complicated and equipment heavy option.

Phosphate removal resins take out silicates but your also taking out, well, phosphates. They typically go in a media bag or reactor. Maybe run phosguard until silicates are gone, turn it off, and then dose phosphorous. I don't know if phosguard is fast enough but maybe you could even run right out of the tap, through a reactor or water filter housing.

I think letting your furnace heat it over a day or 2 is the way to go. A 20% water change with 78F tank water and 68F fresh water only drops your tank to 76F. If that's too much for you, let your furnace warm it then turn on a heater to bring it up the last bit.
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