It is very difficult to maintain chemical balance in my pool which is a five year old one. I have never changed the water in the pool. The salt cell is getting clogged more often than before. I am thinking of changing the water in the pool, but I have no experience in changing it. Is it something I can do myself or should I contact any swimming pool service and repair company like Solda Pools in Brampton in my location? If it is something I can do myself, is there any instructions available?