All CBD Isolate shows minute traces of THC. There is no way to remove this completely unless you make synthetic isolate.
CBD is extracted, purified and isolated. All intermediate products in the isolate production contain high amounts of THC. Isolate contains THC as an impurity. Standard isolate available on the market contains usually 100-200 mg/kg of THC, this amount is not visible in the standard HPLC methods in labs.
We supply another product aimed particularly for the UK market we called we call “High Purity” isolate currently we are 15-20 mg/kg, our goal of 2,5 mg/kg will be achieved very soon. We have developed our own in house detection methods.