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Originally Posted by spikehs
hmmm maybe.... could PVC be "slicker" ?
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The " slicker " is gonna come as algae coats the inside a bit ... the difference in sound between PVC and ABS would be in harmonic resonance ( thickness / density etc ) ... just wait awhile as Jonathon said and it will quiet down or use flexible tubing like I do and reduce the number of 90's that way
Cheers