[Reef Pilot]

I check my tap water in Langley every once in while, and most times it is near 50. I know here they also use ground water, so maybe our water isn't quite as good as elsewhere in Metro Vancouver.

But what really surprised me just recently, is when I changed my 10 micron sediment filter (1st filter). It is usually brown, but this time (after about 4 months use) it was also covered with a brown/reddish slime. My flow had suddenly slowed, which is the usual clue to change that filter, but I have never seen it this bad.

So my guess is that sometimes the water quality may vary, for some reason, maybe because of construction in the area. But at least my RO/DI filter always does the job, where the final water is 0 or 1 at worst.

I have a before and after TDS meter on my filter system to measure RO output and DI separately. Usually my RO water is 0 or 1, but it does rise to 4 or 5 sometimes (DI still mostly 0). Then I open my RO flush and DI bypass valves for about 10 minutes or so, and the RO goes back to 0 or 1 after that.