Flushing is the least of your worries.
Read on.

"The Bottom Line
â?¢ Hydrogels are organic compounds that will degrade after 2-5 years; they are not a long-lasting
solution to droughty conditions
â?¢ Exposure to fertilizer salts will increase the degradation rate of hydrogels
â?¢ When hydrogels degrade, one of the byproducts is acrylamide, a deadly neurotoxin and potential
carcinogen
â?¢ Acrylamide can be absorbed through the skin or by inhaling; people who have a likely risk of
exposure to this compound absolutely require safety clothing and dust masks
â?¢ There are safe (albeit shorter-lived) alternatives to polyacrylamide hydrogels, including starchbased
gels and others currently used in cosmetic surgery
â?¢ There are other environmentally sound ways to reduce water usage and improve water retention
of soils than through hydrogels"

You will find this, and more in the mythbusting link in my sig.

Aloha,
Weeze