About the OTO and DPD-FAS kits ----- the OTO is very reliable but not super accurate. It will only read chlorine levels up to 5ppm. The FAS-DPD kit allows you to read chlorine readings up to around 50ppm which becomes important if you need to shock the pool or if you have a high CYA pool which requires you to run higher than normal chlorine readings.
Hope this clarifies these things for you.

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