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Lol, I have not promoted using silicone to seal PVC, I use solvent. Sealant is used in sealing the acrylic to the PVC which is a very tight push fit. Your design used a smaller diameter tube, if you put bio balls in there you would notice a difference because the internal volume is greatly...
A thick bead of aquarium sealant is placed in the gap, the acrylic tube is then pushed into the reducing bush approximately 1" (its a interference fit), a bead of sealer is then applied to the external joint. It is the same principle as how aquariums are held together. You have to remember...
After my first attempt, I have modified the first one quite a bit. I was getting CO2 bubbles in the tank and algae. With the modified version everything is spot on. Ive used 90mm acrylic, 42mm bio balls, some 4mm stainless tubing (one to inject co2 the other to hold the bio balls in place)...
I've just ordered the parts today. I've also ordered a 4mm threaded barb to attach the co2 hose, (drill a 3mm hole into pipe tap hole with 4mm tap, fit barb with a little cement applied to the thread to seal). I'm using it on a Maidenhead Aquatics EFX600, 2200LPH pump, I am going to fit the...
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