DIY cement rock & Phosphates

I have seen alot of people talk about curing cement rock for the aquarium in fresh water to lower the PH, thats fine.
My question for those in the know is concerning Phosphates and the possibility of them leaching into the rock from all this tap water ( is this the case? )as we all know to limit the entery of Phospates to the system.
Streams and backs of toilets are they realy not counter productive?
Waste

 

Not anything you can't remove from the tank over a little time with some phosphate remover, WM.

 

No other thoughts on this?

 

Exactly how high is the phosphates in your tap?

 

pack, im not sure.
I actualy have a freind with a natural spring on his property and was just trying to sniff out any side affects of curing rock that people have had experianced.
Im going to test the water this week to see how pure it is,not sure hopw much I should test for and or whats acceptable for reef tank

 

I thought I read on another 3reef thread that the primary source of phosphates in DIY rock was the use of crushed oyster shells? I will have to dig that up... have you heard that as well?

 

Give it a test. Also, I would really test the spring water before thinking of that too. Check it's TDS and compare to the tap. Often times, spring and well water are worse than tap due to the heavy metals and other things that leach into it straight from the ground.

I remember that thread, but I don't think anyone ever could come up with anything on it. I tried Googling it, and that exact same thread is about the only thing that comes up

 

I know here that our tap water measures at a whopping 345-360 tds

 

Where exactly? In Reno/Sparks it's ~80

 

I must not have gotten to that one Matt, I will have to look into that aswell.

I was thinking that myself too , I will be testing town aswell

Thats some high numbers Civsi must go through some RO filters