Big al pets has the aquaclear 70 replacement sponges for like 2 bucks each right now. 4 if them would work perfect. Some of the best sponges for fliter I have gotten my hands on and never have to be replaced. I have 5 AQ 110 sponges in my sump and I only have to clean them about every 2.5 months
Also my readings today are as follows...
Temp = 80
Ph = 8.4
Alkalinity = 120
Chlorine = 0
Hardness = 75
Nitrite = 0
Nitrate = 60
So much better than Saturday. I did order the freshwater master test kit. It's not here yet. Where I live to get to a decent fish supply store is a 3 hour round trip. There's a small one about a half hour from my house I was there Monday they do not carry the test kit or canister filters. The biggest filter they carry is the bio wheel 360, which I have 2 of.