Stainless steel float switch not so stainless

[KonradTO]

Hi all!
I have a diy ato integrated into a reefpi/robotank combo.
Instead of optical switch I decided for a float switch, just because I feel it is safer in a small tank like mine. It is hanging from the lid so no risk of funky snails unless they learn how to swim.
The problem is that I noticed some tiny stains of rust on the float "stick". Do you think covering it with a thin layer of silicone would prevent rusting? Otherwise I will need to get a plastic one..
Also, given that it is supposed to be stainless steel, what could be oxidising in the water? Iron?
For now I will remove it from the water, in case it is leaching some toxic stuff..

 

[LeftyReefer]

you could try polishing it up to remove the rust and then re-passivating it.
Then again, I realize not everyone has passivating fluids readily available in there garage like I do. lol. might be easier just to replace it.

 

[Lbrdsoxfan]

I use plastic float switches for just that reason. They can crud up too, just not as quickly!

 

[vetteguy53081]

Plastic is the industry norm and assurance of no rusy. I would see if you could get a 3d nylon version made (we have a 3d link on R2R) and problem solved

 

[KonradTO]

No chances it can prevented with silicone?
I ordered an optical switch for my ato reservoir. I might use it until I find a good switch. Unfortunately those on amazon are too small

 

[KonradTO]

Plastic is the industry norm and assurance of no rusy. I would see if you could get a 3d nylon version made (we have a 3d link on R2R) and problem solved

Wow this is good news. I cannot find a good plastic one. If it is feasible I will print it why not. Any chance you know the name of the project?

 

[vetteguy53081]

Wow this is good news. I cannot find a good plastic one. If it is feasible I will print it why not. Any chance you know the name of the project?

3D Printed & Handmade Aquarium Items

www.reef2reef.com

 

[DopamineKata]

They call it stainless steel because it doesn't rust in air. Salt water will still wreck it.

 

[flagg37]

Even 316 stainless steel (marine grade) will rust being submerged. Titanium is the only metal I know of that doesn’t react to being submerged in saltwater. Plastic is going to be your best option.

 

[Crabby48]

Name says it all stain-less.

 

[EeyoreIsMySpiritAnimal]

For the record, good old fashioned rust, while obviously not desirable on equipment, won’t harm your tank in small amounts. Remember that iron is one thing we test for and add back if it’s too low. Hope this gives some piece of mind

 

[KonradTO]

For the record, good old fashioned rust, while obviously not desirable on equipment, won’t harm your tank in small amounts. Remember that iron is one thing we test for and add back if it’s too low. Hope this gives some piece of mind

I am more concercened about heavy metaals present in the steel..
For now I covered the float with silicone until I find a similar float in plastic

 

[KonradTO]

3D Printed & Handmade Aquarium Items

www.reef2reef.com

There's a lot of holders and stuff but I don't see any floats.. am I missing something?