I currently have a HTH/Taylor 6-way and a el cheapo Kem Tek test kit at my disposal. Both use OTO and phenolphthalein for Cl and pH testing, while the HTH kit has tests for CH and CYA.

I told the person who has the pool we need to get a DPD test for Cl, and I was wondering if I use the test vessels with a reference card and the appropriate reagents - or would I be better served with a separate DPD test kit?