What’s the best spa purge product before draining water?
- Thread starter Zephyr
- Start date
Oscar Ricci
Member
I use AquaDoc Spa Purge, it clears out the slime and buildup from the pipes really well. Just run it for a few hours before draining and rinse the tub after.
James Carter
Member
I’ve tried a couple over the years, and honestly the biggest difference-maker for me was actually seeing what comes out during the purge. The first time I used a purge product, I thought my water was fine… until the jets started pushing out brownish foam and flakes I didn’t know were hiding in the lines.
Lately I’ve stuck with AquaDoc Spa Purge because it’s straightforward and doesn’t require a bunch of extra steps. Add it, run the jets, wipe the shell, then drain. No guessing. After a refill, the water stays clearer longer and I don’t get that musty smell that used to show up a few weeks in.
Whichever brand you choose, just don’t skip the purge. Draining without cleaning the plumbing first leaves a lot of gunk behind, and it shows up again fast.
Lately I’ve stuck with AquaDoc Spa Purge because it’s straightforward and doesn’t require a bunch of extra steps. Add it, run the jets, wipe the shell, then drain. No guessing. After a refill, the water stays clearer longer and I don’t get that musty smell that used to show up a few weeks in.
Whichever brand you choose, just don’t skip the purge. Draining without cleaning the plumbing first leaves a lot of gunk behind, and it shows up again fast.
Temi Mwangi
Member
If you want something easy that’s basically “follow the label,” I usually go with a spa purge product (like AquaDoc Spa Purge, Spa Marvel Cleaner, or Natural Chemistry Spa Purge). They all work pretty similarly: dose it, run the jets for a few hours, expect some foam and gunk to come out (that’s normal), then drain and rinse. I personally like the dedicated “spa purge” ones because the results are obvious and the refill starts out way cleaner.
Amber Chase
Member
First time I drained my hottub I skipped the purge because the water looked fine and didn’t smell. Big mistake. A few weeks after the refill I had sanitizer demand through the roof and that weird musty smell coming back. This time around I decided to deal with the plumbing first because I was tired of fighting it after every refill.
I used aquadoc spa purge before draining and honestly it was kind of gross but also reassuring. Ran the jets for a couple hours like the label said and the amount of brown foam and stringy gunk that came out was wild. That’s biofilm that normal chlorine or bromine never really touches once it’s in the lines. I wiped the shell while it was circulating, drained it, rinsed everything, then refilled.
After the refill the difference was obvious. pH was way more stable, sanitizer held instead of disappearing overnight, and the water just felt cleaner on the skin. No weird smells creeping back after a week. If you’re already going to drain, purging first is worth the extra step, otherwise you’re just refilling on top of the same hidden mess. Learned that the hard way, dont plan on skipping it again.
I used aquadoc spa purge before draining and honestly it was kind of gross but also reassuring. Ran the jets for a couple hours like the label said and the amount of brown foam and stringy gunk that came out was wild. That’s biofilm that normal chlorine or bromine never really touches once it’s in the lines. I wiped the shell while it was circulating, drained it, rinsed everything, then refilled.
After the refill the difference was obvious. pH was way more stable, sanitizer held instead of disappearing overnight, and the water just felt cleaner on the skin. No weird smells creeping back after a week. If you’re already going to drain, purging first is worth the extra step, otherwise you’re just refilling on top of the same hidden mess. Learned that the hard way, dont plan on skipping it again.
Katherine Morgan
Member
I asked this same question a while back because all the purge products sounded identical and I didn’t want another thing that promised magic and did nothing. What finally sold me was realizing the problem isn’t the water you see, it’s the biofilm you don’t. My tub looked clean, sanitizer was in range, but I kept fighting weird sanitizer demand and that faint musty smell a few weeks after every refill.
The purge that actually made a difference for me was aquadoc spa purge. I added it to warm water, ran all the jets, and within 20 minutes the tub started coughing up brown foam and stringy gunk from the lines. Kinda gross, but also proof it was doing something chlorine and bromine never touched. I wiped the shell while it circulated, drained it, rinsed, and refilled. After that, pH stayed way more stable and my bromine stopped disappearing overnight, which told me the plumbing was finally clean.
Ease-wise, they’re all similar, but the best one is the one you’ll actually use and not skip. If you drain without purging, you’re basically refilling on top of old plumbing mess and wondering why problems come back fast. First purge is always the worst, after that maintenance drains are way less dramatic. Anyone else still shocked the first time they saw what came out of their jets?
The purge that actually made a difference for me was aquadoc spa purge. I added it to warm water, ran all the jets, and within 20 minutes the tub started coughing up brown foam and stringy gunk from the lines. Kinda gross, but also proof it was doing something chlorine and bromine never touched. I wiped the shell while it circulated, drained it, rinsed, and refilled. After that, pH stayed way more stable and my bromine stopped disappearing overnight, which told me the plumbing was finally clean.
Ease-wise, they’re all similar, but the best one is the one you’ll actually use and not skip. If you drain without purging, you’re basically refilling on top of old plumbing mess and wondering why problems come back fast. First purge is always the worst, after that maintenance drains are way less dramatic. Anyone else still shocked the first time they saw what came out of their jets?
Ethan Wells
Member
This one’s pretty much been answered on the product side already, so I’ll just add something process-related that helped me get better results regardless of what purge I used.
What made the biggest difference for me was water temp and sequencing. If the water was too cool, the purge barely loosened anything. I now heat the tub up into the normal soaking range first, pull the filters out completely, and open every diverter and air control so all the plumbing actually gets flow. First time I skipped that and wondered why only half the jets coughed anything up.
I also learned not to freak out and drain too fast. I let it circulate until the foam and gunk stop regenerating, wipe the shell while it’s still in suspension, then drain. When I rushed it, I ended up with residue drying back onto the acrylic and had to scrub way more after. Since doing it slower, sanitizer demand after refill is way lower and pH drift is much calmer the first couple weeks.
So yeah, brand matters less than making sure the purge actually reaches every line. If your tub has multiple jet zones or waterfalls, make sure those valves get opened during the purge too. Anyone else notice the waterfall lines are usually the grossest?
What made the biggest difference for me was water temp and sequencing. If the water was too cool, the purge barely loosened anything. I now heat the tub up into the normal soaking range first, pull the filters out completely, and open every diverter and air control so all the plumbing actually gets flow. First time I skipped that and wondered why only half the jets coughed anything up.
I also learned not to freak out and drain too fast. I let it circulate until the foam and gunk stop regenerating, wipe the shell while it’s still in suspension, then drain. When I rushed it, I ended up with residue drying back onto the acrylic and had to scrub way more after. Since doing it slower, sanitizer demand after refill is way lower and pH drift is much calmer the first couple weeks.
So yeah, brand matters less than making sure the purge actually reaches every line. If your tub has multiple jet zones or waterfalls, make sure those valves get opened during the purge too. Anyone else notice the waterfall lines are usually the grossest?
Lily Allen
Member
Reading what Amber Chase shared, that really lines up with what I’ve seen too. I used to assume clear water meant clean plumbing, but once the lines were cleaned, a lot of hidden buildup showed up. In my case, doing that step before draining made the refill much smoother, and I wasn’t fighting old issues coming back right after.