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|   I had a similar problem and determined it was a batch of mislabeled 5 micron filters that ended being 1 microns.  I just took one filter out at a time until my outlet pressure jumped back up.  If you end up with all your filters out and still no flow I would start bypassing components.  You may have introduced a bit of plastic from one of the wrappers that is stuck in a line. Dan 
				__________________ Link to my Tank Upgrade Thread Dan Leus, Marine Biologist 20+ Years Marine Aquarium Experience Save the Reef, Buy a Frag! | 
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|   Hmm...good suggestions.  I have taken out the prefilter and tried already...no improvement.  I also took out the first carbon block...but the prefilter was back in while I tried that.  No improvement either.  Never thought about plastic in a line as I did try to check to see if there was a build up anywhere, but nothing. My water to start with is about 125-135 TDS 
				__________________ Mark...  290g Peninsula Display, 425g total volume. Setup Jan 2013. |