The DPD powder for testing free chlorine will leave black stains on the test vial and the stir bar (if you use a magnetic stirrer), so the tftestkits.net kits come with one vial marked "Chlorine Only" for that test, and another vial for the other tests. I rinse my vials (with pool water before testing, and with tap water after) but I don't regularly clean them with alcohol, so I like having two.
Here's my
TF-Pro kit. Modifications:
- Caps labeled with drop counts and multipliers (thanks to @Dirk for that genius tip)
- Test vials replaced by Taylor 9198 vials so I can use a SampleSizer
- One X-shaped stir bar per vial
- Vials marked "FC", "CH", and "SALT" at the 10ml line, "TA" at the 25ml line
- One CYA reagent bottle removed (and stored separately) to make room for the K-2042 KMPS Interference Removal kit
- FC/pH color comparator cut in half, and the FC half discarded; a second CYA reagent bottle removed to make room for it
- R-0600 reagent (for use with the FC color comparator) discarded and replaced by a SampleSizer
- Salt reagents stored where the FC/pH color comparator used to be
- CYA viewing tube stored upside-down to prevent pinching and cracking the open end
- CYA reagent-bottle cap replaced by the cap from a CYA mixing vial
- K-1106 Phosphate Test kit, thermometer, and extra DPD scoop under the net on the lid
- 16oz plastic bottle with press cap, for collecting pool water
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