I think you need more chlorine. SWCGs can be great for maintaining chlorine in your pool but are not very goot at bringing it up. I'd put 5 or 6 Cups of plain 6% household bleach (no fancy scented splashless or outdoor - just plain bleach - 6%) and do it quick before your pool turns green.

The FAS-DPD test that in the K-2006 separately measures Free Chlorine (FC-kills germs and algae) and Combined Chlorine (CC-indicates FC is engaged in oxidising stuff in the pool).

If you haven't yet ordered a K-2006, you should. It should be especially helpful as there's no shades of yellow to distinguish - sample turns pink if chlorine is present - add drops until sample turns clear, should be easier to read for you.