I am just a householder, but it seems to me that if you have an oldish system with some black sludge in it, a Magnaclean will stop it getting worse by trapping the new stuff, and a chemical clean (which will only cost you £15 plus some of your time) will loosen some of the existing sediment.
So at modest cost you will be better off than you were before.
At best it will save you having a future blockage, and save you hundreds of pounds on repairs and powerflushing.
At worst it will cost you £15 on chemical plus an extra £100 for a Magnaclean if you can afford it. When you see how much sediment you get out I guarantee you will be amazed and delighted.
So at modest cost you will be better off than you were before.
At best it will save you having a future blockage, and save you hundreds of pounds on repairs and powerflushing.
At worst it will cost you £15 on chemical plus an extra £100 for a Magnaclean if you can afford it. When you see how much sediment you get out I guarantee you will be amazed and delighted.