I have the 40 in my 90 , alls I kin say is dis , holy COW !!!!! , just 1 one these babies cleans off my rock and makes a great wave .
What setting do you have it on? I also have a 40 in my 90 and I feel like it's not enough.
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It's typical chinese design/produced product, POS IMHO. i have 2-40 and one is strong, the other is weak, same mode same setting. we get what we paid for.