I've been using purigen for a couple of months and like it. I've noticed that my nitrates are about 25% lower with it, so it's not a miracle cure but it does help. I've also found that it does recharge easily in a 1:4 mix of bleach water, just make sure to rinse it very well and I do a final soak with dechlor before I add the bag back into my filter. On my overstocked 110 african tank I had to do the first recharge in just under a month, but was able to go over two months before the second recharge. Now that everything is under control I should be able to go much longer before recharging again.