- Joined
- 26 Aug 2016
- Messages
- 6,833
- Reaction score
- 1,010
- Country
True I didn't want to complicate it! Even if it's just 20%, after 10 times round the system 90% of the water will have been through the filter. So your definitoin of pointless is for a heating engineer, not a DIYer But to get 90% of the crud, it needs everything to stay in suspension. If a radiator is crudded up already doesn't matter where the filter is tbh.Hard to say that when it's unknown what's on that leg of the return??
My point is really that anywhere's better than nothing, but you can cover more cases with better placement.
Q: While we're on the topic - mag filter should go before the boiler, air separator/spirovent should go after (hottest point), but how about the combined spirocombi units? I put ours after, but now I'm wondering whether I should move it before the boiler after all.