Maybe it will help to see the 3 tiers
1) k2005 (small bottles) and purchase a k1515 (FC) and CYA test kit. -no discount after piece mealing it.
2) k2006 (smaller bottles) VS TF100
3) k2006C VS TFpro
1) k2005 (small bottles) and purchase a k1515 (FC) and CYA test kit. -no discount after piece mealing it.
2) k2006 (smaller bottles) VS TF100
3) k2006C VS TFpro