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Should be an expiration date on the bottle. If stored in a dry place it'll likely last even longer.

Cicada nymphs?

This doesn't answer much about its usefulness in pools or how effective it is for what you want: The phosphonate you listed goes by HEDP as a quick abbreviation. The salt just means in place of a proton(s) it has a sodium ion(s). It's effectively the same thing. It's a chelator so it's a good...

In the typical DPD chlorine drop test you are measuring free and total chlorine separately. The R-0870 powder contains your DPD and the R-0871 is the titrating agent. The R-0003 is a potassium iodide solution that you add to get your total chlorine reading. Your free chlorine is considered your...

Hi Adrian, The DPD drop-test works for bromine you just have to multiply your result. In what I have seen, bromine has issues with bleaching and reliability at lower concentrations than it does with chlorine. I wouldn't trust DPD drop-test readings at high concentrations of bromine. DPD can...

I don't know how many people here have aquariums, but I've been on a number of aquarium forums where people are as particular about water care and water chemistry as people on TFP. That's probably the best starting place. We just set up a small freshwater tank and got a few kits to check the...

They are definitely still open. I recall people talking about waiting to hear back from customer support in older threads. Sounds like a slow response in that department is a theme in the company. Maybe it's a one-person department and that person happens to be on vacation/sick?

You are going to lose hypochlorite, the active chlorine sanitizer, with time. As you pointed out, temperature will accelerate the decomposition. One of the decomposition products is oxygen. I don't think leaving the cap loose is going to do you any favors in keeping the bleach concentration up...

I've been creeping on this forum for awhile now to get a better handle on pool care. Your post compelled me to make an account just to ask for a picture of the thousands of insects 📷 I'm sorry about your infestation issues and hope they are resolved soon!