I have a Shurflo Blaster 3901-2214 that is probably original to the boat in 2001. Not sure what it flows now but the stream is pretty weak. This is supposed to be a 3.5 gallon per minute pump. I haven't measured it but it might flow a gallon per minute now. Is it normal for these pumps to decrease flow with age? I'd like to run a livewell with my washdown pump but I don't think this one will cut it. Would a new 3.5 gal per minute pump do it? Or should I upsize the pump?