These are the pads i used.
This breathable wall is fairly priced for someone that doesn't want to build their own.
https://www.growerssupply.com/farm/...s-gs_evaporative_coolers;pg109009_109009.html
https://www.growerssupply.com/farm/...ku=108997&fromSku=109009&isDoc=N&rel=nofollow