Best sealant for leak repairs?

I have a leak from where the filter box mounts to the tub. I plan on pulling it off and re-sealing this but can sonmeone recommend the best sealant to use for this type of application?

Thanks in advance.

-Brian

I would recommend replacing the spa filter gasket if you are removing the spa filter assembly

I have the same problem with my Amish Country spa at the same spot. It leaks at the flange, at the top of the filter basket. I lower the water level below this flange and the leak stops. There are six screws on the flange, attaching the filter basket to the tub shell. I cannot get the flange removed. I think it must be PVC cemented fast to the plumbing below, with no union to disconnect there. I tried adding Fix-A-Leak, which stopped it in abouit 2 hours, but after I drained and refilled the spa, it started leaking again. A slow but steady drip, about 2 quarts a day in a catch bucket. If the spa was outside, I wouldn't care, as I could just top it off weekly. But it is inside, so I would prefer it fixed. There has got to be a way to get this flange apart. What would the professional spa repair people do in a case like this?

Is it possible to send me a digital picture of the filter set up and the bottom where you think it may be glued? Most filter set ups that have baskets have a front face plate that sandwiches the filter assembly to the wall of spa. They have screws around this faceplate with a gasket behind. I would like to see which style you have if possible. My email address is mary@hottubworks.com

Here are two attached photo's. One of the filter basket, and the plumbing underneath the filter basket. The black stuff around the flange is rubber gasket cement I put on. It will easily scrape off. The blue coloring around the joints suggests that they are cemented fast.

There should be a gasket underneath the ring with the screws that probably should be replaced. I am sure you tried tightening the screws to try and get it to quit leaking. The canister is glued at the bottom where it attaches to the tee fitting. You may have enough room the unscrew the screws on top and drop canister enough to replace gasket. If not enough room then the tee fitting would need to be cut out and replumb the fitting back to canister. That would be the best way to repair the leak by replacing gasket.

After a roundabout, I was able to locate a contact at Fox Pools who was familiar with servicing Amish Country spas. With his direction, I was able to push the whole filter basket assembley up from below about 1.5 inches, after unbolting the flange and cutting away the sprayed on insulation at the shell and basket joint underneath. After scraping away the old silicone sealant, I applied new sealant under the flange and rebolted the basket down. I had enough clearance so I didn't have to cut any pipes. No leaks now. Thank you MaryH for your assistance. I got the heater fixed also. You can read about that in the heater section.

Glad to hear you could get it repaired without any cuts, and thank you very much for your updates on both repairs.