coucld be grit, has it ever worked or is this the first time instalation? if its the first time its been used it may have been installed incorrectly or as simple as its a faulty part exchange it with your retailer
hope this helps
un wire the immersion, crack the seal ( undo the joint a little bit) with the cylinder fall of water, this helps keep wait on the cylinder and you'll crack the seal a lot easier. drain down, take out the immersion, wire-wool the thread in the cylinder to get rid of any crap that will stop the...
both the above are correct but dont silicon ANYTHING!!! theres no need if installed properly and if you ever need to change the syphon its all stuck together with silicon and every last bit would need to be scraped off to reseal or ur end up with leaks as the washers will not sit properly due to...