High PH in new water?

Nate77 · Aug 11, 2021

I mixed up a batch of saltwater yesterday, the PH is testing at 9.6 on hanna , off the chart on API and Salifert?

Last batch I mixed week ago everything was fine, This is the same box of salt

Water RO/DI 14 tds in 0 out
Salt Fritz RPM (using since I have started)
dKH 6.7

Brute trash can
Heater and powerhead in brute

lapin · Aug 11, 2021

You did not put in any things else in the water like baking soda by accident?

Righteous · Aug 11, 2021

Maybe double check your salinity and alkalinity measurements?

Nate77 · Aug 11, 2021

Just water , salt , heater and powerhead

Salinity 1.023 (checkes this around 8x now)
Alk 6.7 on hanna , 6.8 on red sea 7.0 on salifert

Garf · Aug 11, 2021

Nate77 said:
Just water , salt , heater and powerhead

Salinity 1.023 (checkes this around 8x now)
Alk 6.7 on hanna , 6.8 on red sea 7.0 on salifert

Try mixing a mini batch of water in a jug, about 35ish Grams per litre. test pH. If it’s normal, bleach or something has got into the big batch, then ditch.

Nate77 · Aug 11, 2021

Garf said:
Try mixing a mini batch of water in a jug, about 35ish Grams per litre. test pH. If it’s normal, bleach or something has got into the big batch, then ditch.

Thanks will give this a go , and if same guessing salt can go bad?

Randy Holmes-Farley · Aug 11, 2021

I don't believe it can be accurate. It would rapidly precipitate lots of calcium carbonate at that pH, bringing the pH back down.

Nate77 · Aug 11, 2021

Just mixed up a 1 gallon batch at 1.023 , ph 9.4 , Alk 6.5. This was right away

I'll check it again in hour

Randy Holmes-Farley · Aug 11, 2021

Nate77 said:
Just mixed up a 1 gallon batch at 1.023 , ph 9.4 , Alk 6.5. This was right away

I'll check it again in hour

IMO, it is not accurate, but if it was that high, simple aeration will bring it down to 8.2 or less.

Nate77 · Aug 11, 2021

Randy Holmes-Farley said:
IMO, it is not accurate, but if it was that high, simple aeration will bring it down to 8.2 or less.

Just put another pump in see what happens

Garf · Aug 11, 2021

Nate77 said:
Just put another pump in see what happens

What’s the pH meter reading of your tank?

Nate77 · Aug 11, 2021

Garf said:
What’s the pH meter reading of your tank?

8.2

Randy Holmes-Farley · Aug 11, 2021

Nate77 said:
8.2

Measure each pH (tank water and new water) with the same meter in the same cup not in the tank.

The new salt water still reads above pH 9 and the tank is near 8.2?

If true, there's something wrong with the salt mix.

Nate77 · Aug 11, 2021

New mason jar
Tank 8.1 , fuge/sump 8.1

Same mason Jar new water
9.5

Randy Holmes-Farley · Aug 11, 2021

And this is correct: ??

"Last batch I mixed week ago everything was fine, This is the same box of salt"

So you made a batch of salt water and it was OK in pH, then a new batch of salt water from the same dry salt is not good?

Do you use separate anion and cation DI resins? When one is depleted (not 0-1 ppm TDS), it can get really high or low in pH of the pure RO/DI.

Nate77 · Aug 11, 2021

Randy Holmes-Farley said:
And this is correct: ??

"Last batch I mixed week ago everything was fine, This is the same box of salt"

So you made a batch of salt water and it was OK in pH, then a new batch of salt water from the same dry salt is not good?

Do you use separate anion and cation DI resins? When one is depleted (not 0-1 ppm TDS), it can get really high or low in pH of the pure RO/DI.

Correct, last batch from same box of dry salt , was 8.2ph and 11alk

Mixed bed DI , was using aquatic life RO/DI twist in , This is first batch with BRS 4 stage, I flushed 15gallons before I used it , aquatic life booster pump which auto flushes everytime you plug it in.