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Chlorine has a shelf life of between six months and several years, depending on its type and formulation. Liquid chlorine can often lose its effectiveness in just a few weeks. Pool owners can find themselves with overstock that they need to get rid of. The best way to dispose of excess chlorine is to take it to a hazardous waste collection site and let the pros handle it.  

According to the Environmental Protection Agency (EPA), hazardous waste is generally classified into four main categories:

1. Characteristic Wastes: These exhibit at least one of four hazardous traits: ignitability (flammable, like gasoline), corrosivity (can rust or decompose materials, like car batteries), reactivity (unstable and can explode, like aerosol cans), or toxicity (harmful when ingested, like lead-based paint).

2. Listed Wastes: These are specific wastes from manufacturing and industrial processes that the EPA has officially designated as hazardous. They include byproducts from processes that use solvents, pesticides, and other chemicals.

3. Universal Wastes: These are commonly generated hazardous items that are subject to streamlined regulations. Examples include batteries, pesticides, mercury-containing equipment (e.g., bulbs), and some lamps.

4. Mixed Wastes: This category includes waste that contains both hazardous and radioactive components, making it subject to regulation by both the EPA and the Nuclear Regulatory Commission.

Lead toxicity comes from inhaling lead or consuming it. Before the 1980s, when the government banned lead from consumer use, it could be found in paint, plumbing, pipes, ceramics, and even gasoline. Lead paint is toxic for the same reason lead itself is toxic, which is why lead poisoning from paint presents the same as lead poisoning from water or food sources, with a slight increase in respiratory symptoms vs. digestive symptoms. Lead paint is most dangerous when it’s old and peeling, cracking, or otherwise disturbed. This increases the concentration in the air and, therefore, in breathable air. 

The best way to remove lead paint is by wet hand sanding and removing all dust and residue with a HEPA vacuum. Professionals may also strip and scrape lead-based paint with a paint scraper. In some cases, you may choose to have a pro encapsulate or enclose your lead-based paint surface by covering it with a sealant or a new material. You may also choose to replace the material altogether.