Title: Coolant recommendation for Antminer S19 Hydro

Hi everyone,

I'm looking for recommendations for a suitable coolant for my Antminer S19 Hydro.

I'm currently using Aquacomputer DP Ultra, but I suspect it might be causing issues with my circulation pump (similar to a Grundfos pump).

After the system has been shut down for a longer period, the pump rotor becomes difficult to turn manually. However, after rotating it several times, the resistance gradually disappears, and the pump starts and runs normally.

I suspect the coolant might be contributing to this issue.

My cooling loop:

1× Antminer S19 Hydro

Materials: copper, brass, and aluminum

No antifreeze protection needed

Maximum coolant temperature: approximately 60°C

I'm looking for a coolant that:

Is compatible with copper, brass, and aluminum

Contains corrosion inhibitors to protect against galvanic corrosion

Prevents bacterial and algae growth

Is suitable for continuous operation

Is preferably available in the EU

Has anyone experienced similar pump issues with DP Ultra? What coolant would you recommend for this setup?

Thanks in advance for any advice!