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Here's an article that would be worth saving: http://successfulreefkeeping.com/learn/salinity-mixing-saltwater/ A decent refractometer (and calibration fluid) will go a long way in keeping your salinity at the proper level. For your PO4 I'd suggest putting a Hanna checker on your wish list.

Well, your salinity is too high, so you could start by taking small amounts of water out of the DT and replacing it with RO/DI, until it's down to 1.026. Is there any correlation between these high Alk readings and your current salt mix? It's pretty obvious that water changes aren't going to...

Here's the readings I got with your water samples: DT : Sal. 1.03 pH 8.4 Ca 490 Alk off the chart PO4 out of range(so high the hanna couldn't read it) when I added the reagent the sample turned dark purple. Make up: Sal. 1.024 pH 8.0 Ca...

My suspicion too. Or a mushy floor, that gives when you add the weight.

I'll float the container to get the temp right, and check the salinity first.

That's one of the things I'll be checking once I get some of his water.

If you already have one, I'd use it for a QT or hospital set up, but not on your DT.

Is this going to be a reef set up? If so, why run a UV?

Looks good John. Is that black paint, or back pain for the tank? :biggrin:

I live in Mt. Laurel, if you want to bring a couple of quarts of both your DT and make up water we can test it here.

It takes me about 6 weeks to drop 1dKH, but I'm dosing Kalk everyday. But, this is something that is going to be different for every tank, depending on your load.

How often are you doing WC's? Have you checked the Ca, Mg and Alk reading in your make up water?

@ 19dKH your alk is off the charts. pH is high. What is your salinity?

What is your Ca and Mg? What are you using to test with? i.e. Salifert, API, etc. It might be a good idea to post your water param's. Good read here: http://www.wetwebmedia.com/alkalinity.htm?h=

Matter resolved, thank you everyone for your input.

It's a little had to tell from the picture, but is the water intake against the glass? I think if it's against/too close it may impede the flow of water into the pump.

Where are you located?

I have a really good HVAC guy here in Mt. Laurel. This is for a unit I have in Mays Landing. I have a guy I feel I can trust, but I want to make sure he uses a good condenser. So, I was looking for some opinions.