Air Conditioning Water Blockage

[Flytrade]

I have written here before about this problem, and now it's back again.
Previously I had been able to clear the blockage by blowing into the hose going out of the a/c pump. However, now that does not work. My next thought is to hook up a water hose to the hose coming out of the pump, and use the increased water pressure to clear the line. Is that a good idea, or would that put too much pressure on the system?
Once I get the line clear, I plan to use some Barnacle Buster in a garden insecticide sprayer, and hook it up to the system. After flushing the system I'll let it sit overnight to kill whatever is growing in there. Is that also a good idea or there some other way to flush the system?
Or should I be thinking of something else to solve this ongoing problem?

 

[ocgrant]

I used the hose trick on mine and it worked fine. Had to work it on and off, on and off using the pressure bursts to break free the blockage. I did this on one of my 4 units because it was my issue. Secondly i would just flush the coil for an hour with buster and not overnight. Might cause too much damage.

 

[mquiet]

You are on the right path. Connect garden hose after the pump and blow the line out. Then use BB with a circulating pump in a 5 gallon bucket. Connect to the same AC hose. Then also connect the the end of the AC line prior to going overboard and run that back to the bucket. Circulate for an hour and everything will be clear. The Barnicles will dissolve in the solution. Once done, flush system again with fresh water and then connect back to normal.

 

[Flytrade]

You are on the right path. Connect garden hose after the pump and blow the line out. Then use BB with a circulating pump in a 5 gallon bucket. Connect to the same AC hose. Then also connect the the end of the AC line prior to going overboard and run that back to the bucket. Circulate for an hour and everything will be clear. The Barnicles will dissolve in the solution. Once done, flush system again with fresh water and then connect back to normal.

Thanks for both these inputs. I'll give it a try.
However, there is one more piece to the puzzle that I did not mention.
I live on a fresh water canal, so when I get home I turn on the a/c and flush the system with fresh water. That is why I am so surprised I continue to have this problem. Does anyone have any thoughts on this?

 

[bahamabreisus]

Welcome to warm southern water. We have to do this at least twice a year.

 

[bc225]

I clear my lines at least twice a season. I have made up fittings to flush forward and backward using a fresh water hose on my 460 sundancer. I also flush the ac by hooking up fresh water directly to a/c forward and back again. My boat has 3 A/C`s and a common drain. The strainers should be checked at least once a month. The boat is in brackish water so clogged a/c is a constant maintenance issue.I found that searay in explicity installed a 90 degree plastic fitting on my application which of course became clogged until switch out to straight fitting.