A good app to allow 2nd WhatsApp account on same device?

My phone is dual sim and I'm looking for a way to run the official WhatsApp app on one number then be able to use WhatsApp with my 2nd line.

Are there any good reliable apps I could use to run WhatsApp on my 2nd line?

If you phone is a newer Samsung, you can try Knox. Parallel Space is another good app for keeping two copies of the same app with different logins on the same phone. Both apps will let you password-protect (or fingerprint) your 'second' phone.

Thanks. Not a Samsung, so I'll check out parallel space