If you are getting water dripping down the waste line (drain) when your filter is running there is a leak in the multiport (handle) mechanism on the filter. Depending on the type the handle mechanism can be taken apart by screws or a lock nut. Inside will be rubber seals or a rubber gasket. These may be worn, bent, or dry of grease. If you have a cartwheel styled rubber gasket in yours it should be glued down with a contact cement. If it isn’t it will lift and water will leak down the drain.
If your pool is losing water there are a number of self tests you can do. Firstly, if you let the water go down and mark where it stops. If it stops near a pipe or tiles or a crack this might give you a hint. It will stop level with the leak. Secondly, block all the returns (jets) on the pool walls and block the skimmer box (under basket) and see if the water still goes down. If the water doesn’t go down with the second test then you have a broken pipe. If it does you have a leak in the pool somewhere, most likely the light or the main drain. Contact us with the above information and we will be able to give you a better idea of the problem and how to fix it.
If you have pipes that are dripping or leaking then this just requires simple re-plumbing. Most pool shops will be able to help explain to you how to do it or do it for you. There are a number of products that can be used to plug a leak but in plumbing it is better to replace it than to try to seal it.