I am going to try the ones that Corinne use from Amazon at some point.
I think they are a knock off of the AG sponges. The price is better, though.
AG is $28 and Urban Leaf is $17 for 50 pieces.
Park is $11 for 60.
However with Park there is shipping to pay..not worth it unless you are buying other items.
If you buy AG or UL from Amazon there is no shipping charge if one has Prime .
So..pay your money, make your choice! All are good IMO.
The problem was the algae that had me trying to compare them for a long time.
Now that issue seems to be 'O-vuh'. as we say in Boston(which is going to have another day in the 'real feel temps' of o-vuh 100 humid degrees! The only critter in the yard was a lonely robin this morning..THEY don;t even want to venture out..