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Re: phosphate in my tap water

Thanks Tom. Nitrates in the tap are at about 0.3 mg/L.

(Does mg/L corresponds to ppm? That could have some big implications). 

Actually, orthophosphate is listed at PO4 mg/L at 0.5 with total phosphates of closer to 1.2 mg/L (I don't know if any of the total phosphate is unavailable to plants. Calcium at 35 mg/L.

Two other figures:
  K, mg/L:  1.6
 Mg, mg/L: 11.3

I do dose with Flourish, . Would the plants require any epsom salts.

For those interested, I'm using the stats for Chicago lake water at:  http://www.ci.chi.il.us/Water/November2000.html

-- Stephen

> > I have about 1 ppm phosphate in my tap water. Given that I'd like to do
> > weekly/biweekly water changes and don't want to try removing the phosphate, I
> > would like to get some recommendations for a good target nitrate level. I have
> > 2x55 W CF in a 55 gallon. Tom? Beuller? Beuller?
> > 
> > ;)
> > 
> > - Stephen
> > 
> Consider yourself lucky. What's your NO3 from the tap? Anyway, lots of CO2,
> NO3-2-10ppm (15ppm or more tended to give rise to glass algae), heavy
> traces(20-30mls weekly of Flourish or TMG),l K2SO4 1/2 teaspoon weekly.
> Do 50% or larger water changes. 1/4 teaspoon 2 x a week will take care of
> the NO3 if you have a moderate to small fish load. Observe your tank after
> water changes. You'll see a PO4 effect.
> Regards, 
> Tom Barr