Buffering newly mixed salt water

[bigpunter]

Im at my wits end. I have tried several times without success to buffer newly mixed salt water. I use RODI water that is first circulated for 24 hours prior to mixing with salt, then for another 24 hours after i have mixed in the salt. I use Insant Ocean and it consistently has a PH of 7.9 after allowing it to sit 24 hours. I use a digital PH meter that is accurate and because i am doing 50% water changes i want to get the PH up to 8.2-8.4 before replacing my tank water. I had a green hair algae bloom as a result of high phosphate levels (i stupidly was adding the waste water from the RODI unit). I have ruined two large batches of new salt water, the first batch dosing with seachem PH buffer and the second with Kalkwasser. I dont think i overdosed (though it is a possibility) because the PH of the water after dosing was 8.2-8.4. Im not sure whether the kalkwasser precipitated the magnesium, but the water is so cloudy that you cannot see the bottom of the tub...the seachem buffer also had the same effect. What on earth is going on? Am i a fool to try and buffer the newly mixed salt water or is it simply a problem with Instant ocean? There has to be a way to get the PH up without causing the new water to cloud up everytime....any suggestions?

[Luukosian]

A lot of people use baking soda(sodium bicarbonate) to raise the ph and buffer the water. Its probably the main ingredient in that seachem buffer anyways. Maybe you could give that a try, but you shouldn't have to add enough that it makes the water cloudy just to raise the ph a few tenths of a point.

[Frankie]

I think 7.9 is acceptable and you can just use the water without adding a buffer~