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RO/DI units are they necessary?


Anthony

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I believe RO/DI is very important. If you think about how much you topup from evaporation (and as Brian says, if you also use ASW) then every dissolved solid in the water you are adding to the tank is adding another nutrient. I have a TDS meter on my RODI unit, shows on average 75ppm of dissolved solids in and 0ppm out (of course this is different depending on where you live) If I were just to topup straight from the tap, at 3-5 litres a day, thats alot of dissolved solids being added over a couple of weeks, especially considering we are striving to keep nutrients in a reef tank to a minimum. Heres my 4-stage unit:

rodi-unit-with-tds.jpg

If you are looking at RO/DI, I think Michael @ Pet Planet was looking at bringing some in at a good price. Otherwise Anthony Preston in Howick (Ph: 09 534-5127) does them for probably around the $400 mark.

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If you are looking at RO/DI, I think Michael @ Pet Planet was looking at bringing some in at a good price. Otherwise Anthony Preston in Howick (Ph: 09 534-5127) does them for probably around the $400 mark.

$425 for a 4 stage unit

$620 for a 5 stage drinking water system ( this is a very good price others have quoted at around the $1300 mark for similar units)

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