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The toilet in one of our bathrooms routinely flushes incompletely. It does not clog or back up, but it takes several fill/flush cycles to get all the "material" to go down. It just seems to be weak overall, like the flush volume is too low. I suspect that this is the original toilet that was installed when the house was built (early 1970s).

Short of replacing the toilet, is there anything I can do?

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Have you tried adjusting the fill valve / float arm so the tank fills higher? – Steve Jackson Sep 9 '11 at 17:22
You could post a video of it flushing (just water, no "material"). – Jay Bazuzi Sep 9 '11 at 17:33
up vote 5 down vote accepted

One thing you can try is to shorten the chain to the flapper. Sometimes a long chain leading to the flapper will not allow you to open the drain fully (you are only lifting the flapper just a little bit). A partially lifted flapper will not allow the maximum volume of water to flow into the bowl in the shortest amount of time possible, causing a weak flush.

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You can easily verify this, by removing the tank cover and flushing normally. If the flapper does not lift all the way, shorten the chain. – Tester101 Sep 9 '11 at 18:05
You can also watch how quickly it falls back down & seals ... it shouldn't fall back down 'til the water's drained from the tank. If it falls too early, you may need to replace the flapper, as it's not keeping an air bubble under it. – Joe Sep 10 '11 at 3:00
Shortening the chain seems to have done the trick. – kmm Sep 10 '11 at 19:56

Using the K.I.S.S. formula, my first thought would be to see what is in the tank drain. I've found a Scuba Steve equivalent, a sock and a toilet "breath mint".

If it's the latter, use gloves / eye protection. I got the bleach tablet out with a serrated knife but since I did not have gloves on, I got light chemical burns. Within a month I had fingerprints again so my cat burglar days were done. Sadly, I returned to being a t*rd wrangler.

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Could be mineral buildup in the rim's water channel. See this answer: Incomplete Flushing Fix

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