I was told that Hasa makes a Cyanuric Acid that is a baby fine powder so dissolves in a bucket reasonably well and is shown here? Most CYA takes a while to dissolve so their pulverizing it into a fine powder will certainly help. Has anyone tried this? Does it dissolve more quickly? I used Dichlor this season to raise the CYA somewhat, but was not happy with it's somewhat incomplete dissolving (had to mix with water several times) and it seemed to have some residue that made the water taste more metallic for a few days (no, I don't drink my pool water, but do taste it when swimming).
There is also a liquid slurry form of conditioner called Instant Pool Water Conditioner shown here, but that's about twice as expensive (or more) as regular CYA. I spoke to the chemist who created this -- it's a slurry of the monosodium salt of cyanuric acid so is close to pH neutral and mixes instantly with pool water.