High Alkalinity fresh salt water

[Chefoffduty]

Hi
I am looking for some advice with high KH reading with fresh batch of salt water mix.

I'll give you the story so far over the last couple of days. I noticed after the last couple of water changes my alk spiked from 8-9 kh after testing the water the day after. I have been using redsea blue bucket for quite a while. I then went to buy a new bucket of read sea blue as I had finished what i had at home.
I mixed up a batch and tested prior to doing a water change I tested 10.550 with Hanna Alkalinity H1755 checker. Wanting a second reading i also tested with salifert test kit which came back very similar.
I contacted redsea and they asked for the batch number and gave me there icp for the batch which was 2.75 meq/l which is 8.2 ish? They said I can send them in a sample if i would like them to test for me.
I then got a second opinion from my lfs and that was also tested 10.5. So I decided to purchase a bucket of tropic marin pro reef which I wanted to change to at some point going forward anyway.
I made a fresh batch and tested again with both the Hanna and salifert and have tested 10.08. Again this is to high for me and Much higher than they say.

I am not sure what to try next
Any ideas?

Thanks

 

[Chefoffduty]

Hi I have worked it out no need for help anymore.
Thanks

 

[Ceri720]

Hi I have worked it out no need for help anymore.
Thanks

Hi there - I am having the same issue - my salt water is testing at 10.5 dkh before even adding to tank. Tank alk is rising - what did you figure out??

 

[Chefoffduty]

Hi
It was my fresh ro water, the TDS was to high 54 when should be 0.
I changed the DI resin and fixed it straight away
I should have checked this first really.
Hope this helps