PH too high after AN rebed

[Quality Time]

I recently dumped my Acid Neutralizer tank and replaced the bed and media due to a low flow issue and also it hadn't been done in atleast 10 years.

My raw PH is 5.5 so I used a 75/25 blend of Calcite/Corosex which is about what I have been adding annually . Maybe 10% more Corosex this time because I had trouble getting the PH above 6.8 previously. Now the PH is in the 11-12 range?? My Oakton meter is calibrated and still shows a raw PH of 5.5 so I assume it's correct. I'm stumped if anyone can help please.

I'm contemplating dumping it again but don't know what ratio to use or if I should just use straight Calcite.

 

[Reach4]

I have no experience with such filters, but did you backwash after putting the new media in?

 

[Sponsor]

 

[ditttohead]

Put the system into an extended backwash cycle. At least 20-40 minutes. Then allow it operate normally for a few days before retesting. This is normal on startup.

 

[Quality Time]

I will try an extended backwash. This has been going on for a few weeks though and the system has done the normal backwash atleast twice since the rebed.

 

[ditttohead]

If the pH continues to be too high, then reducing the Magnesium Oxide quantity would be a solution. Or it will do it on its own...

 

[Quality Time]

Thank you for the replies Dittohead. I knew it would come down eventually but wasn't sure how long it will take. Or if it was safe to use/drink such high PH water and what effect it might have on my plumbing?