it has to do with one of the plants that make Trichlor burning down. I believe only 3 such plants in the US. So the price of tablets have gone from like $75 to $150 and now over $225. Because of this the price of liquid chlorine has gone up due to more people buying it. Luckily we don't use much Trichlor here at TFP or it would really hurt our pockets. I could deal with $1, $2 $3 more per 4 pack of liquid chlorine.