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Hey all, new homeowner here that hasn't done much with plumbing yet. We bought a house with a private well, and a whole home water softener + filter. Prior to moving in we had the water tested and the results came back with high levels of bacteria so we followed instructions to sanitize the well with bleach + vinegar. We hadn't run the water for an extended amount of time before closing, as the seller only let us come by one time to get the water sample for the test. We did not notice any pressure issues then, but weren't there long enough to tell. Fast forward to closing day, we bring all the stuff needed to clean the well and do so that night. A couple days later we finally get all of our stuff moved in and start noticing that the water pressure inside is really low, especially at sink faucets after flushing a toilet. It seems to match the symptoms of a blocked line, as the pressure was measured at 40 PSI and then quickly drops to nearly 0 PSI. We are unsure if the process of cleaning the well caused the pipes to be blocked or if the issue was present beforehand. I picked up a water pressure test gauge to try and isolate the issue. Here's the troubleshooting I've done so far:

1. Check pressure at water pressure tank in crawlspace. Consistently between 40-60 PSI with kitchen faucet running.
2. Check water pressure on outside faucets with kitchen faucet running. Consistently between 40-60 PSI.
3. Check water pressure at water heater inside. Builds up pressure to 40 PSI at most, and pressure drops to roughly 0 PSI after less than a minute. Water pressure rises back to 40 PSI after roughly a minute and a half.
4. Turn water softener/filter to bypass and test interior water pressure. No change.

It might be worth noting that the pressure tank is a 20 gallon tank, but I do not have the specs for the pump and need to figure out the flow rate and minimum run time of the pump to make sure the pressure tank is sufficient.

I wanted to post this here and see what others would have to suggest, and if it is sounding like blocked pipes to others, find out what exactly the steps to fix this problem would be, short of have the plumbing redone.
 

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Welcome to the forum.

Your whole house filter is probably downstream of the pressure tank (where there is no problem) but upstream of the water heater (where there is), so that’s a good candidate to investigate to see if it is the issue. That is, unscrew the filter body and replace the filter cartridge. If you don't have a replacement, run it without the filter for a few minutes and you'll understand if a clogged filter is causing the pressure/flow restriction.

A UV disinfection device is the best way to deal with bacteria in the source water, not a one-time bleaching.
 

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You're on the right track, It's likely that opening up the well stirred up some sediment that got stuck somewhere causing a restriction. It could be in a valve body of a shutoff, or an inline filter, or a combination of different places.

what exactly the steps to fix this problem would be
Keep checking the pressure drop in as many places as possible to isolate where it could be. Exercise all the shutoff valves. Start opening things up and try to flush out the sediment.
 
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