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4dkh prior to mixing salt. After it goes through the filter . After I mix Red Sea blue box , it reads 7dkh.
No problem, bet yeah don't worry about your rodi waters dkh, I use filtered water for my top offs and mixing, just checked it and it's 4dkh and I've never had an issue with dosing or my salt mix not mixing to correct values. If you want bump your Salinity up a tad to get you closer to 8dkh so you only buff up 1dkh.
I used 2 different kits. I did get the information I needed . Probably, my water supply runs slightly acidic during parts of the year. Couldn’t that effect a dkh reading to be lower ?That 4 dKH would be test error. True 4 dKH water would have substantial TDS.
you got misinformation.I used 2 different kits. I did get the information I needed . Probably, my water supply runs slightly acidic during parts of the year. Couldn’t that effect a dkh reading to be lower ?
My mistake it was supposed to say 2dkh not 4, and yes I would assume it has some tds as I was testing filtered water not rodi.That 4 dKH would be test error. True 4 dKH water would have substantial TDS.
My mistake it was supposed to say 2dkh not 4, and yes I would assume it has some tds as I was testing filtered water not rodi.
Regular drinking water (bottled) or from refillable 5g jugswhat does filtered water mean?
Tap water can certainly contain substantial alkalinity.
Regular drinking water (bottled) or from refillable 5g jugs
Are folks understanding that ro/di is expected to have no alkalinity?
If it is truly just H20 the pH should be neutral (7) therefore it's shouldn't be alkalineMeaning a DKH of 0?
YesMeaning a DKH of 0?
I would be interested what other kh readings are of filtered fresh water prior to mix and mixed water kh without additional buffs.
If I’m reading 4kh fresh , adding salt which is suppose to bring kh to 8 but only reading 7kh, something isn’t adding up. I would think starting with 4kh, adding salt would make my mixed water kh higher, like 9-10.
I did not comment on this thread, but I also didn't know this. Good to know, thanks.
let's explore that in detail.
Suppose that you have fresh water with an alkalinity of 1.0 dKH (0.36 meq/L).
It must have either
0.36 mM hydroxide (OH-)
or
0.36 mM bicarbonate (HCO3-)
or
0.18 mM carbonate (CO3--; carbonate carries two units of alkalinity)
There must also be counterions present since one can never have just negative charges in water.
Let's assume it is sodium, which is most likely, but the assumption doesn't matter much. In each case, we will have a total of 0.36 mM sodium to balance charge.
How conductive are each of these solutions? We can look them up.
0.36 mM (14.4 mg/L or 14.4 ppm) sodium hydroxide has a conductivity of about 31 ppm TDS
0.36 mM (~30 mg/L or 30 ppm) sodium bicarbonate has a conductivity of about 20 ppm TDS
0.18 mM (19.1 mg/L or 19.1 ppm) sodium carbonate has a conductivity of about 20 ppm TDS
Thus, if the RO/DI water has a TDS of 0-1 ppm, it really cannot have anything close to 1 dKH of alkalinity. Maybe 0.05 dKH max for 1 ppm TDS.