Older XP4 models may have had impellers closer in shape or size to the XP3, not sure when they changed over exactly. The XP4 impellers have an olive green plastic used in the impeller, the older style was grey. When I ordered my replacement impeller for the XP4, I received a new style impeller in a box form Rena with an old style picture on the label.
Here are some reference photos. The new style XP4 impeller is now three blades, a bit thicker blade and taller. The old style is six blades.
Since you know the tank functions well on this filter, I would go with a XP4 and an AC110.
The AC110 filters were on sale for $63.99 from petmountain.com and if you throw in another $12 worth of stuff to get your total over $75, then shipping is free too. http://www.petmountain.com/product/...-512916/aquaclear-aquaclear-power-filter.html
If you want to get a new XP4, petmountain also had those on sale for $169.99 http://www.petmountain.com/product/...2-107524/rena-filstar-xp-canister-filter.html
Otherwise I would look at used filters on Criagslist and in the MFK classifieds.
I'm definitely leaning towards the fx5. It's hard though when I could get 2 xp3s for the price of the fx5.
As far as the air leak is concerned in my original xp3. After purging every bit of air out of the filter, the second I plug the filter in the water level drops down about 1/2" below the lid. I have replaced every gasket. No change. I replaced the entire quick disconnect valve. No change. I replaced the intake and spray bar with the upgrade kit. No change. I also replaced the tubes. No change. Last night I reseated the canister gasket and actually got it to seal without air coming back into the system. Unfortunately it wouldn't pump any water. After about 5 mins it sucked some air in and started pumping water again. I am open to suggestions but am kind of hesitant to spend any more money on this filter. Ive spent about 100$ and for another 20$ I could've bought a brand new xp3.
I did get 6 or 7 years out of the xp3 so i can't be too bitter but... That fx5 does have that new car smell.
I'm definitely leaning towards the fx5. It's hard though when I could get 2 xp3s for the price of the fx5.
As far as the air leak is concerned in my original xp3. After purging every bit of air out of the filter, the second I plug the filter in the water level drops down about 1/2" below the lid. I have replaced every gasket. No change. I replaced the entire quick disconnect valve. No change. I replaced the intake and spray bar with the upgrade kit. No change. I also replaced the tubes. No change. Last night I reseated the canister gasket and actually got it to seal without air coming back into the system. Unfortunately it wouldn't pump any water. After about 5 mins it sucked some air in and started pumping water again. I am open to suggestions but am kind of hesitant to spend any more money on this filter. Ive spent about 100$ and for another 20$ I could've bought a brand new xp3.
I did get 6 or 7 years out of the xp3 so i can't be too bitter but... That fx5 does have that new car smell.
Mine is an older xp4- give or take 3-6years. Im pretty sure its all white execpt for magnet and i know it has 3 blades w/ 2 black seals on each end of impeller rod. Is it the old model?
#1 S. Vettel