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Please would anyone who blames our tap water please stop.
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<font size="2" face="Verdana, Helvetica, sans-serif">Bob,
To me not using a RODI in a reef tank is only looking for incidents like this to happen. Do you know exactly how clean the DFW system is from the resevoir/purification/chlorination plant to Alan's house? Has the system been inspected to ensure nothing has gotten in that could have introduced a possible contaminant into the water? Have there been no breaks in the line? Is all the piping used of a material that will not leech small amounts of minerals and contaminants? Can you say that with 100% certainty?
The reason I bought a RO/DI for my tank is to make sure that no matter what I was putting clean water in my tank. All too often mistakes are made after all it is peole running machines. all it takes is one slip and something gets into a line before it is noticed, it ends up in your tank and sits there. If it were phosphates in small enough quantities you wouldn't even notice it. But if the amounts were to build up in a tank over time end be held in the sand bed or LR, with enough in there they will start a bloom such as this. Once it has started and reaches saturation in the water column it will become self sustaining. Some dies off, breaks down feeds a whole new bloom.
Until the cause is found and removed, treating the symptoms is a moot point.
Saying the water in Calgary is made for reef tanks and isn't the problem doesn't work IMO. Until it has been proven that the entire water system is so clean that it is of a higher quality than what comes out of a RO/DI, I will cite that as a major source for contaminants in a tank. That is the first place I will look in any tank experiencing an algae outbreak on the scale Alan is. Next would be the LR and sand bed. All three possibly have the phosphates bound up in them which is feeding this.
Sorry Alan. Had to say it. I hope this gets cleared up soon. I really do.