My boss did something like that. Try ascorbic acid - try putting some vitamin C tablets in a sock and rubbing them on the rust. If that helps, then look for a chemical at your pool supplier that may be marketed as "stain remover" or "metal out". Also, have your water tested for metals if possible.
Metal expands from heat and contracts in cold
The metal free weights are made from cast iron.
Typically it is Cast Iron* that is used to make weights.
They are made of lead
It depends on how the weights are loaded. If the rack is topheavy, it's likely to tip over, but if you load weights from the bottom up, the rack will surely remain stable. It is designed not to tip with a metal base
barbell
Metal free weight tend to be heavier than plastic ones. It is always recommended to get real weights over plastic ones.
the one with silver in it
Barbell
iron,metal,weights
Weights are usually made of metal, which is denser than sea-water, so they would sink. But, to be awkward, if it were made of wood, it would not sink.
Because of the build up and sudden release (Through touch) of static electricity.